Merge from origin/emacs-26

dee3cdc Minor improvement for docs of completion
c86d419 ; * src/image.c (imagemagick_load, svg_load): Fix typos in co...
6d46fa9 Disable the timerfd interface on Cygwin
3707ea4 Fix a typo in the doc string of 'regex-opt'
d9905d5 Document bash 5.0.0 misbehavior in tramp.texi (Bug#34192)

# Conflicts:
#	doc/misc/tramp.texi

diff --cc configure.ac
Simple merge

diff --cc doc/lispref/minibuf.texi
Simple merge

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

diff --cc src/image.c
Simple merge