Merge from origin/emacs-25

acae275 ; Spelling fixes
d8fac73 Update README for precompiled windows Emacs.
23570fd Clarify documentation of 'vc-responsible-backend' wrt symlinks
f708cb2 Clarify doc string of 'transpose-sexps'
cd05b1d Fix docstring of 'browse-url-firefox-new-window-is-tab'
bdc89eb Improve documentation of 'font-lock-remove-keywords'
4a0c590 Fix documentation of the command summary key
0221b7a Mark relocation workarounds with REL_ALLOC

diff --cc doc/emacs/maintaining.texi
Simple merge

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

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

diff --cc lisp/emacs-lisp/eieio-core.el
Simple merge

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

diff --cc lisp/international/ucs-normalize.el
Simple merge

diff --cc lisp/net/browse-url.el
Simple merge

diff --cc lisp/simple.el
Simple merge

diff --cc lisp/subr.el
Simple merge

diff --cc src/emacs.c
Simple merge

diff --cc src/lread.c
Simple merge

diff --cc src/search.c
Simple merge