bug#3312: 23.0.93; Use punctuation syntax for apostrophe in Info

[Drew Adams]

> I see that Gnus solves this problem by modifying syntax of ' and `
> to whitespace...
> So I'm not sure what is better for Info buffers:
> whitespace syntax (" ") or punctuation (".")?

Either is probably OK.  I would vote for punctuation syntax for ` and ',
especially since they are used not only for `...' but also in Lisp code, and
since they are, in English, punctuation.

[We do have embedded spaces in `...' in the manuals (e.g., search for regexp
`\([a-zA-Z]+ \)+[a-zA-Z]+' in (elisp)).  But either whitespace or punctuation
syntax for `' would be OK for that, since you could in either case get all of
the text easily by clicking the mouse (e.g. double-click mouse-1, then click
mouse-3).]