I only renamed references that I thought were absolutely necessary
and only if the resulting sentence structure wasn't awkward.
If the renaming resulted in awkward structure, I replaced the term
"webhook" with "integration" (but only in some very obvious cases).
Fixes#9500.
We were devoting too much space/text to documenting our Markdown
macro. It is much more concise to just have a description and a
link to an example doc for each major macro.