Avoid double spaces around abbrevations in Texinfo

Avoid double spaces around abbrevations in Texinfo

* doc/emacs/custom.texi (Init Rebinding):
* doc/emacs/dired.texi (Operating on Files):
* doc/emacs/emacs.texi (Top):
* doc/emacs/emerge-xtra.texi (Emerge):
* doc/emacs/files.texi (Files):
* doc/emacs/frames.texi (Drag and Drop):
* doc/emacs/misc.texi (Hyperlinking):
* doc/emacs/modes.texi (Modes):
* doc/emacs/mule.texi (Input Methods):
* doc/emacs/windows.texi (Window Tool Bar):
* doc/lispintro/emacs-lisp-intro.texi
(Lexical & Dynamic Binding Differences):
* doc/lispref/elisp.texi (Top):
* doc/lispref/functions.texi (Functions, Generic Functions):
* doc/lispref/hash.texi (Defining Hash):
* doc/lispref/keymaps.texi (Creating Keymaps):
* doc/lispref/lists.texi (Property Lists):
* doc/lispref/modes.texi (%-Constructs):
* doc/lispref/nonascii.texi (Character Properties):
* doc/lispref/processes.texi (Misc Network):
* doc/lispref/searching.texi (Regexp Functions):
* doc/lispref/syntax.texi (Syntax Table Internals):
* doc/lispref/text.texi (Filling, Checksum/Hash)
(JSONRPC deferred requests):
* doc/misc/calc.texi (What is Calc, Modes Tutorial):
* doc/misc/cc-mode.texi (List Line-Up, Operator Line-Up)
(Custom Macros, Indenting Directives):
* doc/misc/efaq.texi (Colors on a TTY, Security risks with Emacs):
* doc/misc/eglot.texi (Eglot Variables):
* doc/misc/erc.texi (Connecting):
* doc/misc/eshell.texi (Aliases, Completion):
* doc/misc/flymake.texi (Backend functions):
* doc/misc/gnus-faq.texi (FAQ 5 - Composing messages):
* doc/misc/gnus.texi (Gnus Unplugged, Window Layout)
(Filtering Incoming Mail, History):
* doc/misc/idlwave.texi (Online Help, Catalogs):
* doc/misc/wisent.texi (Wisent Overview): Be more consistent with
abbreviations.  Use @: or comma or rewrite to avoid double spaces.
Ref: https://lists.gnu.org/r/emacs-devel/2025-01/msg00909.html