Re: clarity of @xref warning

[Karl Berry]

            foo.texi:2: warning, @xref followed by `)'.
                @xref is meant for use as a whole sentence, or the start of
                one, not in brackets "( )".  Perhaps you mean @pxref.

Thanks for the suggestion.  I added an additional warning when the
incorrect following character is a ), so that the output now looks like
this:

foo.texi:2: warning: `.' or `,' must follow @xref, not `)'.
foo.texi:2: warning: for cross-references in parentheses, use @pxref.

Hope that will be helpful in the future.

(Texinfo's xref system is soooo confusing.  Sigh.)

Best,
karl