Update installation docs for consistency
>>> [!note] Migrated issue
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<!-- Migrated from issue #3578126. -->
Reported by: [pameeela](https://www.drupal.org/user/1431110)
Related to !839
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>We have varying steps for setup with DDEV in different places, we should standardise on a single set of commands.</p>
issue