Merge from origin/emacs-29

Merge from origin/emacs-29

bf7034048c1 ; * doc/emacs/custom.texi (Changing a Variable): Update e...
466d1c98a9e Fix icons.el when icon does not exist as a file
2a861124e89 ; Improve documentation of 'buffer-match-p'
dc9d02f8a01 * lisp/isearch.el (isearch-search-and-update): Let-bind '...
9308d9a74ab * src/comp.c (Fcomp__compile_ctxt_to_file): Fix hash tabl...
a2a6619b282 Provide decent documentation for 'help-quick'
ab66b749a27 ; * src/window.c (Fset_window_margins): Doc fix.
1a677d1429d treesit--pre-syntax-ppss: Fix args-out-of-range in intern...