doc/emacs/buffers.texi (Uniquify): Clarify the default uniquification.
doc/emacs/indent.texi (Tab Stops): Improve wording.
doc/emacs/cmdargs.texi (General Variables): Improve docs of
EMACSLOADPATH. Index all the environment variables.
(Misc Variables): Index all the environment variables.
doc/lispref/text.texi (Registers): Document register-read-with-preview.
doc/lispref/internals.texi (Building Emacs): Improve indexing.
f982b37104