Typo fixes in 199[01]/dds

In the README.md file of 1990/dds there was a typo fixed.

In the thanks file for 1990/dds I clarified something and in the case of
1991/dds there was a typo that was confusing: '-Wno-error' should have
been '-Werror'; the fix enabled in the encrypted string the former but
the problem was some compilers in some platforms (clang, macOS) default
to -Werror which prevented the entry from compiling code as the code
generated had warnings.

1990/dds/README.md

@@ -57,7 +57,7 @@ This is the DDS-BASIC Interpreter (Version 1.00).
 - NEXT variable
 - GOSUB exp
 - RETURN
-- GOTO exp\
+- GOTO exp
 - IF exp THEN exp
 - INPUT variable
 - PRINT string
@@ -118,7 +118,7 @@ The Speed of DDS-BASIC Interpreter (Version 1.00) relative to Microsoft Advanced
 BASIC 3.31 is approximately 60%.
 
 The code size could be further reduced by doing ugly things like not declaring
-the return type of functions, not freeing memory, #defining define, and joining
+the return type of functions, not freeing memory, `#defin`ing define, and joining
 lines.  In its present 1536 character form the program is reasonably portable
 (it may fail to run in a tagged object architecture) and nicely formatted (it
 fits in an `80*25` screen).

thanks-for-fixes.md

@@ -856,8 +856,8 @@ more like the original in this way by redefining `free` to have the comma
 operator itself.
 
 Cody fixed another compiler error by removing the erroneous prototype to
-`fopen()`.  Cody also changed a file to be a proper `FILE *` and fixed a typo in
-[LANDER.BAS](1990/dds/LANDER.BAS).
+`fopen()`.  Cody also changed a `char *` used for file I/O to be a proper `FILE
+*` and fixed a typo in [LANDER.BAS](1990/dds/LANDER.BAS).
 
 Cody also made this use `fgets()` instead of `gets()` to make it safer and to
 prevent an annoying and potentially alarming warning at compiling and/or linking
@@ -973,7 +973,7 @@ slightly more like the original, even though it's unused.
 
 Cody fixed a segfault that prevented this entry from working in any condition
 and he also made it work for clang. Clang (at least in some systems?) defaults
-to having `-Wno-error` and the code that the entry generates had some warnings
+to having `-Werror` and the code that the entry generates had some warnings
 that were causing compilation to fail as it just ran `cc a.c`. It ran it by what
 was once `system(q-6);` but with clang this was not enough..