Avoid deprecation warnings with Texinfo 6.8

Avoid deprecation warnings with Texinfo 6.8

* doc/lispref/functions.texi (Function Safety):
* doc/misc/srecode.texi (Parts of SRecode):
* doc/misc/wisent.texi (Wisent Semantic, Wisent Lex):
* doc/misc/pcl-cvs.texi (Editing files):
* doc/misc/bovine.texi (top, Starting Rules)
(Bovine Grammar Rules, How Lexical Tokens Match)
(Optional Lambda Expression):
* doc/emacs/msdos.texi (Windows Keyboard):
* doc/emacs/buffers.texi (Several Buffers):
* doc/emacs/text.texi (Text): Avoid using @inforef, which is
deprecated.