* 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.
* doc/lispref/eval.texi (Intro Eval, Symbol Forms): Minor tweaks for
correctness with lexical scoping.
(Eval): Copyedits.
* doc/lispref/sequences.texi (Sequence Functions): Don't repeat the
introduction already given in the parent.
(Vectors): Copyedits.
(Rings): Move from lists.texi. Note that this is specific to the
ring package.
* doc/lispref/lists.texi (Cons Cells): Copyedits.
(List Elements): Mention push.
(List Variables): Mention pop.
(Rings): Move to sequences.texi.
* doc/lispref/strings.texi (Text Comparison): Minor qualification.
* doc/lispref/symbols.texi (Definitions, Symbol Components): Mention variable
scoping issues.
(Plists and Alists): Copyedits.
