Fixes in several README.md files

There are many more fixes to be made but I wanted these in. Even the
files I have checked will have to be checked again in more detail but I
needed these committed so I could fix something in another file that
will need a new branch. More updates to README.md files will then be put
into yet another branch if the pull requests have not yet been merged
before I get to these updates (which really ought to be a lot of
fun!  :-) )

1984/laman/README.md

@@ -19,7 +19,7 @@ to:
 	;++f)a[		b<<5|c]		=d++,b+=	e;for(		f=0;f<O
 	<<5|c]^=	a[b<<5		|c]^=a[		(k-(b+1		))<<5|c]
 
-I hope you have the C beautifier! The program accepts ONE positive
+I hope you have a C beautifier! The program accepts ONE positive
 argument.  Seeing is believing, so try things like:
 
 	./laman 4
@@ -28,6 +28,10 @@ argument.  Seeing is believing, so try things like:
 
 This code should run you in circles.
 
+NOTE: this program will likely segfault if you do not provide an argument and it
+will not print anything if the number is not positive or not a number.
+
+
 Copyright (c) 1984, Landon Curt Noll.
 All Rights Reserved.  Permission for personal, educational or non-profit use is
 granted provided this this copyright and notice are included in its entirety