Fix typos in "Private keys" and "Use a webhook secret" sections

[iamdulanga]

Corrected grammatical issues:

• Added missing verb "is" in "However, this is not as strong..."
• Fixed subject-verb agreement in "signature... matches the secret"

These changes improve clarity and maintain the professional quality of the documentation.

Why:

Closes:

What's being changed (if available, include any code snippets, screenshots, or gifs):

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

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Source	Review	Production	What Changed
apps/creating-github-apps/about-creating-github-apps/best-practices-for-creating-a-github-app.md	fpt ghec ghes@ 3.17 3.16 3.15 3.14 3.13	fpt ghec ghes@ 3.17 3.16 3.15 3.14 3.13

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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[Copilot]

Pull Request Overview

This PR corrects minor grammatical errors in the “Private keys” and “Use a webhook secret” sections of the GitHub Apps best practices doc.

• Added the missing verb “is” to improve clarity in the environment‐variable recommendation.
• Fixed subject–verb agreement by changing “match” to “matches” for webhook secret verification.

[Sharra-writes]

Nice! Thanks for fixing these. I'll get this added to the merge queue once checks are passing. 💛

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