Update Variables chapter of Lisp manual to handle lexical binding.
* doc/lispref/variables.texi (Variables, Local Variables, Void Variables): Edit to make the descriptions less specific to dynamic binding. (Local Variables): Default max-specpdl-size is now 1300. (Defining Variables): Edits for lexical scoping. Delete information about starting docstrings with *. De-document user-variable-p. (Tips for Defining): Remove an unimportant discussion of quitting in the middle of a load. (Accessing Variables, Setting Variables): Discuss lexical binding. (Variable Scoping): Rewrite. (Scope, Extent, Impl of Scope): Nodes deleted. (Dynamic Binding): New node, with material from Scope, Extent, and Impl of Scope nodes. (Dynamic Binding Tips): Rename from Using Scoping. (Lexical Binding): Rewrite. (Using Lexical Binding): Rename from Converting to Lexical Binding. Convert to subsection. * doc/lispref/customize.texi (Variable Definitions): Add custom-variable-p. Move user-variable-p documentation here.
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