Update Emacs Invocation chapter of Emacs manual.
* doc/emacs/cmdargs.texi (Action Arguments): No need to mention EMACSLOADPATH. (General Variables): Add xref to Lisp Libraries. (Initial Options): Copyedits. (Resume Arguments): Node deleted; emacs.bash/csh are obsolete. (Environment): Clarify what getenv does. (General Variables): Clarify EMACSPATH etc. Emacs does not assume light backgrounds on xterms. (Misc Variables): TEMP and TMP are not Windows-specific. (Display X): Copyedits. (Colors X): -bd does nothing for GTK. (Icons X): Gnome 3 doesn't use taskbars. * doc/emacs/misc.texi (Shell): Document exec-path here. * doc/emacs/rmail.texi (Movemail): Add xref for exec-path.
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