Move generalized variable documentation from misc/cl.texi to lispref
* doc/lispref/variables.texi (Generalized Variables): New section, adapted from misc/cl.texi. * doc/lispref/elisp.texi (Top): Add Generalized Variables to menu. * doc/lispref/lists.texi (List Elements, List Variables): Mention generalized variables. * doc/misc/cl.texi (Control Structure): Update for setf now being in core. (Setf Extensions): Rename from Basic Setf. Move much of the former content to lispref/variables.texi. (Modify Macros): Move pop, push details to lispref/variables.texi. (Customizing Setf): Copyedits for setf etc being in core. (Modify Macros, Efficiency Concerns, Porting Common Lisp): Further namespaces updates.
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