Merge from origin/emacs-26

Merge from origin/emacs-26

b98cf9c ; Fix a typo in the Emacs manual
700fcd7 * doc/emacs/help.texi: Fix paren typo.
c9c0e40 More minor changes in shell-related nodes of Emacs manual
e6bf19c Fix inaccuracies in "Shell Ring" node of Emacs manual
087681b8 Improve documentation of kmacro commands and variables.
be2e8cb * doc/man/emacs.1.in: Document --fg-daemon and --bg-daemon.
1d9e66a Don't check non-X frames for z order (Bug#31373)
7dc028e Check NSWindow is actually a frame

Conflicts:
	src/nsfns.m