From MageKing17: Improves sexp help text to clear up possible confusion about indexes that are zero-based.

git-svn-id: svn://svn.icculus.org/fs2open@10920 387891d4-d844-0410-90c0-e4c51a9137d3
From MageKing17: Fixes for a couple of clang warnings.

git-svn-id: svn://svn.icculus.org/fs2open@10921 387891d4-d844-0410-90c0-e4c51a9137d3
Fixes an unintended linebreak removal in previous commit


git-svn-id: svn://svn.icculus.org/fs2open@10922 387891d4-d844-0410-90c0-e4c51a9137d3