💥 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/emacs/vc/config.el

@@ -41,20 +41,20 @@
   (global-git-commit-mode +1)
   (set-yas-minor-mode! 'git-commit-mode)
 
-  (defun +vc|enforce-git-commit-conventions ()
-    "See https://chris.beams.io/posts/git-commit/"
-    (setq fill-column 72
-          git-commit-summary-max-length 50
-          git-commit-style-convention-checks '(overlong-summary-line non-empty-second-line)))
-  (add-hook 'git-commit-mode-hook #'+vc|enforce-git-commit-conventions)
+  (add-hook 'git-commit-mode-hook
+    (defun +vc--enforce-git-commit-conventions-h ()
+      "See https://chris.beams.io/posts/git-commit/"
+      (setq fill-column 72
+            git-commit-summary-max-length 50
+            git-commit-style-convention-checks '(overlong-summary-line non-empty-second-line))))
 
-  (defun +vc|start-in-insert-state-maybe ()
-    "Start git-commit-mode in insert state if in a blank commit message,
+  (add-hook 'git-commit-setup-hook
+    (defun +vc--start-in-insert-state-maybe ()
+      "Start git-commit-mode in insert state if in a blank commit message,
 otherwise in default state."
-    (when (and (bound-and-true-p evil-mode)
-               (bobp) (eolp))
-      (evil-insert-state)))
-  (add-hook 'git-commit-setup-hook #'+vc|start-in-insert-state-maybe))
+      (when (and (bound-and-true-p evil-mode)
+                 (bobp) (eolp))
+        (evil-insert-state)))))
 
 (after! vc-annotate
   (set-popup-rules!