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

[Juri Linkov <juri@jurta.org>]

>> +    (modify-syntax-entry ?' "." st)
>
> There wasn't much discussion after this, but it seems to me that having
> ' be
>
>     (modify-syntax-entry ?\' "w" st)
>
> which it currently is, isn't all that nice in Info buffers.  `M-.' and
> the like doesn't work as well as one would like if stuff like `this'
> gets treated like "this'" by `M-.'.

I see that Gnus solves this problem by modifying syntax of ' and `
to whitespace:

  (defvar gnus-article-mode-syntax-table
    (let ((table (copy-syntax-table text-mode-syntax-table)))
      ;; This causes the citation match run O(2^n).
      ;; (modify-syntax-entry ?- "w" table)
      (modify-syntax-entry ?> ")<" table)
      (modify-syntax-entry ?< "(>" table)
      ;; make M-. in article buffers work for `foo' strings
      (modify-syntax-entry ?' " " table)
      (modify-syntax-entry ?` " " table)
      table)
    "Syntax table used in article mode buffers.
  Initialized from `text-mode-syntax-table.")

So I'm not sure what is better for Info buffers:
whitespace syntax (" ") or punctuation (".")?