minor improvements to bugs.md

Added double whitespace around level 1, 2 and 3 markdown headers
to make it easier to see different sections and entries.

Made a few minor edits.

bugs.md

@@ -1,5 +1,6 @@
 # BUGS and (mis)FEATURES
 
+
 There are a number of known problems with IOCCC winners: many of
 which have to do with differences between today's compiler environments
 and those of today.  In some cases the original code has a bug, some
@@ -18,12 +19,13 @@ entries in the file (if you're not we can add a link to your personal website if
 you have one if you like).
 
 
-## Known bugs that are OK to fix
+## Known bugs to fix
 
 
 ### [1995/cdua](1995/cdua/cdua.c) ([README.md](1995/cdua/README.md))
 
-This did not compile under macOS and after it did it crashed.
+
+This did not originally compile under macOS and after it did compile under macOS, it crashed.
 [Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) fixed this but he
 observed that sometimes the program asks the user to hit return a second time to
 resume solving the maze. It does not always happen. It doesn't seem to be
@@ -34,6 +36,7 @@ type).
 
 ### [2014/vik](2014/vik/prog.c) ([README.md](2014/vik/README.md))
 
+
 [Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) discovered a bug that
 shows itself in some cases (it works in others) when working on his [2020 Enigma
 machine](2020/ferguson2/prog.c) entry. See his
@@ -44,8 +47,10 @@ He provides a tip in testing the problem: it might help to use the Enigma
 machine to find problems as it will allow you to verify what is correct and what
 is not. Again see his README.md for details.
 
+
 ## Compiler specific requirements on type of args to main
 
+
 The following entries have a problem in that the args to main() are not of a
 specific type due this being allowed in earlier C. This shows itself in some
 compilers like clang. Looking at the source code of `clang` there is no way to
@@ -71,6 +76,7 @@ You may provide an alt version for the fix as well.
 
 ### [1989/westley](1989/westley/westley.c) ([README.md](1989/westley/README.md))
 
+
 Although [Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) fixed this for
 some of the versions that are generated (see below tip) it will not work for
 all. He noted that trying to fix it in some cases causes a segfault and in other
@@ -88,24 +94,24 @@ The segfault happens when running the main program.
 
 This will not be a problem with gcc.
 
+
 ## INABIAF (it's not a bug it's a feature)
 
+
 The following entries should NOT be touched: they are system specific by design
 but are noteworthy nonetheless.
 
 
-### [1984/mullender](1984/mullender/mullender.c) ([README.md](1984/mullender/README.md))
-
-This entry is likely to fail and/or dump core on any computer other than a
-Vax-11 or pdp-11. In 1984 machine dependent code was allowed.
-
 ### [1986/august](1986/august/august.c) ([README.md](1986/august/README.md))
 
+
 This entry is known to segfault after printing its output. It was documented by
 the judges and needn't be fixed.
 
+
 ### [1990/jaw](1990/jaw/jaw.c) ([README.md](1990/jaw/README.md))
 
+
 [Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) fixed the scripts to
 work in modern systems. He notes however that the command in the try section,
 the one to test the official C entry, appear to not work with macOS, giving:
@@ -144,9 +150,9 @@ Should the entry use `perror()`? Perhaps not but we're not sure of its purpose
 so it can stay for now with this note.
 
 
-
 ### [1996/westley](1996/westley/westley.c) ([README.md](1996/westley/README.md))
 
+
 This entry will possibly segfault even when showing the proper output in the
 `clock1`, `clock2` and `clock3` scripts. Though this doesn't need to be fixed as
 long as it works right it wouldn't hurt to fix it either.
@@ -154,25 +160,32 @@ long as it works right it wouldn't hurt to fix it either.
 
 ### [2019/endoh](2019/endoh/prog.c) ([README.md](2019/endoh/README.md))
 
+
 As a backtrace quine this entry is SUPPOSED to segfault so this should not be
 touched either.
 
+
 ### [2020/ferguson1](2020/ferguson1/prog.c) ([README.md](2020/ferguson1/README.md))
 
+
 There are some things that might appear to be bugs but are actually features or
 things that are misinterpreted as bugs. See his
 [bugs.md](2020/ferguson1/bugs.md) and
 [troubleshooting.md](2020/ferguson1/troubleshooting.md) files for details.
 
-### ... more to be added later ...
+.. entries to be added later ..
+
 
 ## Mis-features that should not be fixed
 
+
 The following entries should not be touched either as although it might seem
 wrong they are not.
 
+
 ### [1986/holloway](1986/holloway/holloway.c) ([README.md](1986/holloway/README.md))
 
+
 When compiling this entry you might get an incompatible pointer type warning but
 this should be ignored. When [Cody Boone
 Ferguson](/winners.html#Cody_Boone_Ferguson) fixed this he experimented with the
@@ -188,8 +201,10 @@ alternatives and it did not work. Thus if you see something like:
 
 it is NOT a problem and should not be changed.
 
+
 ## Entries that require a compiler that support `-traditional-cpp`
 
+
 The following entries need a compiler that support `-traditional-cpp`. `gcc`
 supports this but `clang` does not. Please be advised that `gcc` under macOS is
 actually gcc if it looks like it's gcc (two different binaries).
@@ -199,17 +214,25 @@ actually gcc if it looks like it's gcc (two different binaries).
 - [1986/wall/wall.c](1986/wall/wall.c) ([README.md](1986/wall/README.md))
 - [1988/dale](1988/dale/dale.c) ([README.md](1988/dale/README.md))
 
-.. more to be added as they are discovered ..
 
+XXX - .. more entries to be added later ..
 
-## Entries that can no longer compile
-
-.. entries to be added later ..
 
 ## Entries that can compile but crash (sometimes or always)
 
+
+### [1984/mullender](1984/mullender/mullender.c) ([README.md](1984/mullender/README.md))
+
+
+This entry is likely to fail and/or dump core on any computer other than a
+Vax-11 or pdp-11. In 1984 machine dependent code was allowed.
+
+Perhaps what is needed is for someone to supply a Vax-11 or pdp-11 emulator for this entry.
+
+
 ### [2004/gavin](2004/gavin/gavin.c) ([README.md](2004/gavin//README.md))
 
+
 Segmentation fault occurs when running `gavin` to produce the kernel:
 
 ```sh
@@ -226,8 +249,10 @@ Undefined symbols for architecture arm64:
 ld: symbol(s) not found for architecture arm64
 ```
 
+
 #### Recent for 2004/gavin mods:
 
+
 In case recent modification are part of the problem, here is a full disclosure
 of what was changed: