Update and edit manual sections on major modes.
* doc/emacs/modes.texi (Choosing Modes): auto-mode-case-fold is now t. * doc/lispref/modes.texi (Basic Major Modes): New node. Callers updated. (Major Modes): Document fundamental-mode and major-mode. (Major Mode Basics): Node deleted; text moved to Major Modes. (Derived Modes): Document derived-mode-p.
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