doc: move v8.getHeapCodeStatistics()

Move v8.getHeapCodeStatistics() to its alphabetic location in the docs.
An effort to alphabetize all the entries met some resistance on the
grounds that it put some things in an order that wasn't logical, but
this one should be uncontroversial, I think.

PR-URL: https://github.com/nodejs/node/pull/36027


Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>