Merge from origin/emacs-26

9d7e08d (origin/emacs-26) Avoid false positives and false negatives o...
75b589c Fix markup related to quoting in Info
fd6ff29 Merge branch 'emacs-26' of git.savannah.gnu.org:/srv/git/emac...
cd2204f Add a package: line to c-submit-bug-report.
a992dca ; Remove empty NEWS sections
ea67270 ; Add NEWS sections for 26.3
45b0946 ; Bump Emacs version to 26.2.50
aae8cc3 * admin/admin.el (set-version): Add NEWS headers for a .50 ve...

diff --cc doc/misc/calc.texi
Simple merge

diff --cc doc/misc/mh-e.texi
Simple merge

diff --cc lisp/info.el
Simple merge