doc: some fixes in console.md
Checklist
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documentation is changed or added -
commit message follows commit guidelines
Affected core subsystem(s)
doc, console
Description of change
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var->const/let -
Object.setPrototypeOf()->Object.create(). The new variant is slightly more verbose, but the former one is warned against as less efficient: see the performance warnings here or here. The changed example was advised as a way to extend a core lib class in a userland lib, so maybe the doc could use a more careful code here. The verbosity is induced by a wish to get the same property descriptors as the others of theconsolemethods.