Document completion styles in Emacs manual; copyedits.
* doc/emacs/mini.texi (Minibuffer File): Minor copyedits. Use xref to Remote Files node instead of linking directly to the Tramp manual. (Minibuffer Edit): Add xref to Blank Lines. (Completion): Add xref to Symbol Completion. Remove redundant example, which is repeated in the next node. (Completion Commands): Minor clarifications. (Completion Styles): New node, split from Completion Commands. Document substring and initials styles. (Strict Completion): Remove information duplicated in other nodes. (Completion Options): Consolidate case difference discussion here. * doc/emacs/files.texi (File Names): Add index entries. * doc/emacs/help.texi (Help Mode): Fix kindex entries.
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