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).