💥 revise hook/var fns naming convention (2/2)

This is second of three big naming convention changes. In this commit,
we change the naming conventions for hook functions and variable
functions:

1. Replace the bar | to indicate a hook function with a -h suffix, e.g.

     doom|init-ui -> doom-init-ui-h
     doom|run-local-var-hooks -> doom-run-local-var-hooks-h

2. And add a -fn suffix for functions meant to be set on variables,
   e.g.

     (setq magit-display-buffer-function #'+magit-display-buffer-fn)

See ccf327f8 for the reasoning behind these changes.

modules/lang/emacs-lisp/autoload.el

@@ -106,7 +106,7 @@ if it's callable, `apropos' otherwise."
 ;;; Hooks
 
 ;;;###autoload
-(defun +emacs-lisp|extend-imenu ()
+(defun +emacs-lisp-extend-imenu-h ()
   "Improve imenu support in `emacs-lisp-mode', including recognition for Doom's API."
   (setq imenu-generic-expression
         `(("Section" "^[ \t]*;;;;*[ \t]+\\([^\n]+\\)" 1)
@@ -125,7 +125,7 @@ if it's callable, `apropos' otherwise."
           ("Types" "^\\s-*(\\(cl-def\\(?:struct\\|type\\)\\|def\\(?:class\\|face\\|group\\|ine-\\(?:condition\\|error\\|widget\\)\\|package\\|struct\\|t\\(?:\\(?:hem\\|yp\\)e\\)\\)\\)\\s-+'?\\(\\(?:\\sw\\|\\s_\\|\\\\.\\)+\\)" 2))))
 
 ;;;###autoload
-(defun +emacs-lisp|reduce-flycheck-errors-in-emacs-config ()
+(defun +emacs-lisp-reduce-flycheck-errors-in-emacs-config-h ()
   "Remove `emacs-lisp-checkdoc' checker and reduce `emacs-lisp' checker
 verbosity when editing a file in `doom-private-dir' or `doom-emacs-dir'."
   (when (and (bound-and-true-p flycheck-mode)

modules/lang/emacs-lisp/config.el

@@ -34,6 +34,9 @@ This marks a foldable marker for `outline-minor-mode' in elisp buffers.")
                ("add-hook" "remove-hook")
                ("add-hook!" "remove-hook!")))
 
+  ;; TODO
+  (put 'add-hook 'lisp-indent-function 'defun)
+
   (setq-hook! 'emacs-lisp-mode-hook
     tab-width 2
     ;; shorter name in modeline
@@ -51,12 +54,12 @@ This marks a foldable marker for `outline-minor-mode' in elisp buffers.")
        rainbow-delimiters-mode
        highlight-quoted-mode
        ;; initialization
-       +emacs-lisp|extend-imenu))
+       +emacs-lisp-extend-imenu-h))
 
   ;; Flycheck's two emacs-lisp checkers produce a *lot* of false positives in
   ;; emacs configs, so we disable `emacs-lisp-checkdoc' and reduce the
   ;; `emacs-lisp' checker's verbosity.
-  (add-hook 'flycheck-mode-hook #'+emacs-lisp|reduce-flycheck-errors-in-emacs-config)
+  (add-hook 'flycheck-mode-hook #'+emacs-lisp-reduce-flycheck-errors-in-emacs-config-h)
 
   ;; Special fontification for elisp
   (font-lock-add-keywords