Improve mutability documentation
This change was inspired by comments from Štěpán Němec in: https://lists.gnu.org/r/emacs-devel/2020-04/msg01063.html * doc/lispref/objects.texi (Lisp Data Types): Mention mutability. (Constants and mutability): New section. * doc/lispintro/emacs-lisp-intro.texi (Lists diagrammed) (Indent Tabs Mode): Improve wording. * doc/lispref/eval.texi (Self-Evaluating Forms): Say that they return constants. * doc/lispref/lists.texi (Sets And Lists): Fix memql mistake/confusion that I recently introduced.
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