Update Abbrevs and Dired chapters of Emacs manual.
* dired.texi (Dired Enter, Misc Dired Features): Document dired-use-ls-dired changes. Mention quit-window. (Dired Navigation): Add index entries. (Dired Visiting): Fix View Mode xref. (Marks vs Flags): Prefer C-/ binding for undo. (Subdirectories in Dired): Add xrefs. (Misc Dired Features): Document some Emacs 24 changes. Add index entries. * abbrevs.texi (Abbrev Concepts): No need to mention abbrev-mode variable, since it is explained in Minor Modes node. (Defining Abbrevs): Copyedits. (Expanding Abbrevs): State default of abbrev-all-caps. Prefer the C-/ binding for undo. (Dabbrev Customization): Add xrefs for case-fold-search and case-replace. * dired-xtra.texi (Subdir Switches): Add xref. * maintaining.texi (VC Directory Commands): Mention quit-window.
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