Fix '../Trunk'

[nielsenjared]

This PR refers to canonical/open-documentation-academy#78

On the legacy site, I found the missing link on https://dev.launchpad.net/PreMergeReviews routed to https://dev.launchpad.net/Trunk which is branches.rst in this repo.

I used the convention outlined in doc-cheat-sheet.rst:

- :doc:`Link text <index>`

Running make linkcheck throws this error, though:

$HOME/.../launchpad-manual/explanation/pre-merge-reviews.rst:46: WARNING: Mismatch: both interpreted text role prefix and reference suffix.

I'm not sure why, but it's also throwing this error, but not throwing it on main:

(explanation/engineering-overview-translations: line   75) broken    http://www.gnu.org/software/gettext/manual/ - HTTPConnectionPool(host='www.gnu.org', port=80): Max retries exceeded with url: /software/gettext/manual/ (Caused by ConnectTimeoutError(<urllib3.connection.HTTPConnection object at 0x7fc96455b940>, 'Connection to www.gnu.org timed out. (connect timeout=30)'))
make: *** [Makefile:110: linkcheck] Error 1

[jugmac00]

Hey @nielsenjared, thanks a lot for your contribution!

You accidentially added double underscore at the end of the :doc: instruction. Once you remove it, it works.

I double-checked the mentioned cheatsheet, and it is correctly documented there.

Is there anything we could do to improve the documentation?

And yes, I am aware, that rst is sometimes a bit hard to work with - though it is very powerful.

[jugmac00]

Thank you!