Emacs Lisp manual updates.
* doc/lispref/intro.texi (A Sample Function Description): Special notation used for macros too. * doc/lispref/objects.texi (Ctl-Char Syntax, Other Char Bits): Copyedits. (Symbol Type): Add xref for keyword symbols. (Sequence Type): Clarify differences between sequence types. (Cons Cell Type): Add "linked list" index entry. (Non-ASCII in Strings): Copyedits. (Equality Predicates): Symbols with same name need not be eq. * doc/lispref/numbers.texi (Float Basics): Document isnan, copysign, frexp and ldexp. Move float-e and float-pi to Math Functions node.
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