docs: Fixes minor typo in Declarative Setup

[philnichol]

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
• The title of the PR states what changed and the related issues number (used for the release note).
• The title of the PR conforms to the Toolchain Guide
• I've included "Closes [ISSUE #]" or "Fixes [ISSUE #]" in the description to automatically close the associated issue.
• I've updated both the CLI and UI to expose my feature, or I plan to submit a second PR with them.
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• I've updated documentation as required by this PR.
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• My new feature complies with the feature status guidelines.
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (07a2e64) 49.49% compared to head (7d58519) 49.49%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #16550   +/-   ##
=======================================
  Coverage   49.49%   49.49%           
=======================================
  Files         270      270           
  Lines       47489    47489           
=======================================
  Hits        23506    23506           
  Misses      21672    21672           
  Partials     2311     2311           

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[blakepettersson]

Thank you!