Remove the dynamic-docstring-function feature.
* emacs-lisp/advice.el (ad--make-advised-docstring): Change args. Ignore function-documentation property when getting documentation. (ad-activate-advised-definition): Use function-documentation generate the docstring. (ad-make-advised-definition): Don't call ad-make-advised-definition-docstring. (ad-make-advised-definition-docstring, ad-advised-definition-p): Delete functions. * emacs-lisp/nadvice.el (advice--make-docstring): Change args. (advice--docstring): Delete variable. (advice--make-1): Leave the docstring empty. (advice-add): Use function-documentation for advised docstring. * progmodes/sql.el (sql-help): Use function-documentation instead of dynamic-docstring-function property. No need to autoload now. (sql--help-docstring): New variable. (sql--make-help-docstring): Use it. * doc.c (Fdocumentation): Remove dynamic-docstring-function.
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