doc: change v8 to V8
Google's V8 engine is styled "V8" and not "v8". Most Node.js docs style it correctly. This change fixes a few instances that are not styled correctly.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
documentation is changed or added -
commit message follows commit guidelines
Affected core subsystem(s)
doc