def-advice!->defadvice! & conform to new advice conventions

This commit does two things:

- Renames def-advice! to defadvice!, in the spirit of naming convenience
  macros after the function/macro they enhance or replace.
- Correct the names of advice functions to indicate visibility and
  intent. A public advice function like doom-set-jump-a is meant to be
  used elsewhere. A private one like +dired--cleanup-header-line-a
  shouldn't -- it likely won't work anywhere but the function(s) it was
  made to advise.

modules/lang/rust/config.el

@@ -54,7 +54,7 @@
 
   ;; `rustic-setup-rls' uses `package-installed-p' unnecessarily, which breaks
   ;; because Doom lazy loads package.el.
-  (def-advice! +rust--disable-package-call-a (orig-fn &rest args)
+  (defadvice! +rust--disable-package-call-a (orig-fn &rest args)
     :around #'rustic-setup-rls
     (cl-letf (((symbol-function 'package-installed-p)
                (symbol-function 'ignore)))