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Add tip for `qs` parameter of hook_civicrm_links.md. Fixed misspelling.

See merge request !978

Improve description for alterDisplayName

See merge request !981

Add "Pipe Reference"

See merge request !980

Lets focus people in on the stuff they care about!

Remove reference to obsolete upgrade-related function

See merge request !979

document Soft Delete

See merge request documentation/docs/dev!977

Requires select()ing something to show data

See merge request !976

Update example to reflect APIv4 as the default

See merge request !975

Fix missing commas in PHP code.

See merge request !974

The previous PHP was not valid,
which was be a problem when copy-pasting from the docs.

extensions/translation: fix the link to the main translation page

See merge request !973

Remove old comments that seem to do more harm than good

See merge request !972

- I removed a comment that pointed to the old confluence page.  I didn't understand the comment so I entirely removed it
- I removed a link to an old testing extension. The extension encouraged extending the internal core test class - which we currently discourage. It also used legacy namespacing conventions (CRM as opposed to \Civi) - which cause quite  a few gotchas in the context of unit tests. I don't think the example adds anything 'good' that the boilerplate doesn't add