Issue #2546248 by scythian, XaviP, darrenwh, mikebell_, ingaro, urbanlegend, jhodgdon, davidhernandez, andypost, joelpittet, emma.maria, cdykstra, Cottser, LewisNyman, joachim: Use consistent style to mention HTML tags in code comments

Issue #2493475 by ifrik, walangitan, XaviP, jhodgdon, batigolix: Fix online docs references in Help to conform to our standards