Docs/http headers clarity

[praveenrajasneo]

Summary:

• Improved clarity of the Strict-Transport-Security header explanation

Changes:

• Reworded a sentence to better describe browser behavior

Reason:

• Improves readability for developers new to HTTP security headers

[szh]

Content looks solid. Please use the PR template

[bad-antics]

Thanks for contributing! This follows the project guidelines well.