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.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
documentation is changed or added -
commit message follows commit guidelines