Fix 1992/buzzard.2 alt code, add try scripts

The bug fix is simply so it can compile. It assumed exit(3) returned a
value, not void. The fixes noted in the remarks (though I did not see
them at a quick glance) of the author are not in the alt version (that's
the purpose of it).

The try.sh and try.alt.sh scripts correspond to the entry and the alt
code.

Updated .gitignore.

Added 'first.alt' to Makefile for the try.alt.sh script.

1992/buzzard.2/help.th

@@ -1,7 +1,7 @@
 : help key  ( flush the carriage return form the input buffer )
 
 " The following are the standard known words; words marked with (*) are
-immediate words, which cannot be used from command mode, but only in
+immediate words, which cannot be used in command mode, but only in
 word definitions.  Words marked by (**) declare new words, so are always
 followed by the new word.