Fix typo

Add CaseContact to hook_civicrm_post() and hook_civicrm_pre() documentation - see https://github.com/civicrm/civicrm-core/pull/14030

Reposition 'Campaign' in list to be alphabetical

show new way for accessing pr test site credentials

Much more could be done but this is probably worth doing as a light edit

Changing flush to clear as the preferred method. I think when it was added there was an assumption devs would be developing against < 5.4 so it made sense to give primacy to flush but times have changed

@totten

I didn't add in the ESR as I don't believe the policy  is clear enough to be documented but generally I understand that the discussion takes place on the ESR channel & PRs are not really encouraged against the branch - the CT would do a PR if they decide to backport or agree someone else would

Clarify that the ContactID refers to the user making the query - my reading had been that it was the contact ID of the contact that was being considered.

Explain what the `$type` parameter means/relates to.

Formatting tweak

Per https://github.com/civicrm/civicrm-core/pull/13762

I believe the getMenuKeyMax function is missing it's underscore inside the hook.

- Updated incorrect interface method name.
- Reorganized to match the de facto standard apparent on other hook pages.
- General content improvements.

Add in notes about support for KeyColumn parameter when using option group as part of a setting pseudoconstant

Describe new variables due to dev/core#457

Describe new variables due to dev/core#457

Adding this clause has led to unreliable query results - better to give no information than to lead them wrong - many reports now disable & reenable full group by but that is referred to elsewhere.

Also better to override whereClause & selectClause