Merge from origin/emacs-27

0bed550e21 (origin/emacs-27) Remove EmacsOpenPanel and EmacsSavePanel...
a0336029db * doc/emacs/files.texi (Auto Save Files): Improve indexing...
57fb8b10c1 Fix inaccurate wording in the Emacs manual
1c487747ab Update ERC module URLs
7d1e9c943f Minor doc string clarification in use-hard-newlines

diff --cc lisp/erc/erc-speedbar.el
Simple merge

diff --cc lisp/textmodes/paragraphs.el
Simple merge

diff --cc src/nsfns.m
Simple merge

diff --cc src/nsterm.h
Simple merge