* doc/lispref/functions.texi (Advising Functions): Try and improve the text.
Add example use of advice-add. (Core Advising Primitives): Rename. Explain handling of interactive specs, including advice-eval-interactive-spec. (Advising Named Functions): Try and better explain the difference with add-function. (Porting old advices): New node. Fixes: debbugs:16959
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