Add a note to say that this hook will only be invoked for API calls if check_permissions is set to 1

The phrase originated in one context (i.e.  discussing a change in the
version-numbering pattern).  In the context of `info.xml` docs, it seemed
helpful to use more concrete wording ("Because 4.7.x and 5.x are
substantively the same series...").

Updating docs to reflect changes made here: dev/release#1 (comment 2843)

Ref dev/core#86

colemanw authored 6 years ago and colemanw committed 6 years ago

See https://github.com/civicrm/civicrm-core/pull/10085
@totten I've added docs for this hook.

ref: https://jameshfisher.com/2017/08/30/how-do-i-make-a-full-width-iframe.html

Also:

- Clarify that PRs don't need to have associated tickets
- Clean up some language here and there

Two arrows were being interpreted as two layers of quotes. I removed one of them. Then I thought, actually, these are not quotes. Maybe we should remove move. And maybe just having them on their on paragraph without any quotes is good enough. I am shying away from using boxes for this since to avoid box fatigue but would be interested in some opinions on the house style.

We ha one "Generating a skeletal extension" and one "Add features"

Add health warning about running Docker on OSX

Per https://en.wikipedia.org/wiki/Uniform_Resource_Identifier#URI_references
it seems that something like `/foo/bar.md` isn't technically a "URL".
So to be more accurate with our language, this commit changes the meta
docs to refer to internal "links" instead.