Update runtime-control.md

[RMDavidson]

Updated link text in line 39 from Controlling nginx to Control nginx

Updated line 5 title from Controlling to Control

Proposed changes

Write a clear and concise description that helps reviewers understand the purpose and impact of your changes. Use the
following format:

Problem: Header and link text needs to be changed from using gerunds (-ing) to imperative (no -ing)

Solution:

• Updated link text in line 39 from Controlling nginx to Control nginx
• Updated line 5 title from Controlling to Control

Testing: N/A

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specific feedback, add them here.

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Closes #ISSUE

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• I have read the contributing guidelines
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• If the change involves potentially sensitive changes¹, I have assessed the possible impact
• If applicable, I have added tests that prove my fix is effective or that my feature works
• I have ensured that existing tests pass after adding my changes
• If applicable, I have updated README.md and CHANGELOG.md

Footnotes

1. Potentially sensitive changes include anything involving code, personally identify information (PII), live URLs or significant amounts of new or revised documentation. Please refer to our style guide for guidance about placeholder content. ↩