Tweak doc of `analyze-text-conversion` vs `post-self-insert-hook`

* lisp/simple.el (analyze-text-conversion): Fix typo.

* lisp/progmodes/cc-mode.el (c-initialize-cc-mode): Add comment about
`post-text-conversion-hook`.

lisp/progmodes/cc-mode.el

@@ -256,6 +256,9 @@ control).  See \"cc-mode.el\" for more info."
 	(put 'c-initialize-cc-mode initprop c-initialization-ok))))
 
   ;; Set up text conversion, for Emacs >= 30.0
+  ;; This is needed here because CC-mode's implementation of
+  ;; electricity does not rely on `post-self-insert-hook' (which is
+  ;; already handled adequately by `analyze-text-conversion').
   (when (boundp 'post-text-conversion-hook)
     (add-hook 'post-text-conversion-hook #'c-post-text-conversion nil t))
 

lisp/simple.el

@@ -11181,7 +11181,7 @@ For each insertion:
     and delete the adjascent pair if
     `electric-pair-delete-adjacent-pairs'.
 
-  - Run `post-self-insert-functions' for the last character of
+  - Run `post-self-insert-hook' for the last character of
     any inserted text so that modes such as `electric-pair-mode'
     can work.