Merge from origin/emacs-26

Merge from origin/emacs-26

e5a2933 (origin/emacs-26) lisp/vc/: documentation fixes
f21f8e6 Document 'desktop-files-not-to-save'
d8917eb Improve documentation of Profiling features
b228839 Improve indexing of "performance" in ELisp manual
ab67b3e Minor change in Emacs manual's VC chapter
c352434 Avoid memory corruption with specpdl overflow + edebug (Bug#3...
593bbda Document comment-fill-column in the manual (Bug#11636)
bd4cc8d * doc/emacs/dired.texi (Marks vs Flags): Copyedits.
69107f3 ; Fix doc typos related to indefinite articles
aaad1e6 Merge branch 'emacs-26' of git.savannah.gnu.org:/srv/git/emac...
5906418 More fixes for the Emacs manual
9ab3df1 ; Fix doc typos related to indefinite articles
66a4e65 ; Fix doc typos related to indefinite articles
35e5c57 ; Fix doc typos related to indefinite articles