Update serving-static-content.md

[theJorge]

Updated Gerund lanuage in titles and subitles.

Proposed changes

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

Problem: Give a brief overview of the problem or feature being addressed.

Solution: Explain the approach you took to implement the solution, highlighting any significant design decisions or
considerations.

Testing: Describe any testing that you did.

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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
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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. ↩

[mjang]

Thanks for your help and congratulations!