Merge branch 'js/trace2-doc-fixes'

Trace2 documentation updates. * js/trace2-doc-fixes: trace2 docs: add missing full stop trace2 docs: clarify what `varargs` is all about trace2 docs: fix a JSON formatted example trace2 docs: surround more terms in backticks trace2 docs: "printf" is not an English word trace2 docs: a couple of grammar fixes