chat.md - typos + more accurate wording

[icecream17]

Why:

Closes:

(I did not open an issue because the pr can be reviewed super quickly)

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

"typos + more accurate wording"
(It's better to just look at the code changes than describe)

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.

[docs-bot]

👋 Hi there! It looks like you've modified some files that we can't accept as contributions:

• content/copilot/responsible-use/chat.md

You'll need to raise a new PR that doesn't include those files, before we can review.

The complete list of files we can't accept are:

• Anything in the root directory
• .devcontainer/**
• .github/**
• data/reusables/rai/**
• .vscode/**
• config/**
• contributing/**
• src/**
• patches/**
• content/actions/how-tos/secure-your-work/security-harden-deployments/**
• content/README.md

We also can't accept contributions to files in the content directory with frontmatter contentType: rai. You can always check out our full contribution guidelines.

[github-actions]

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Table of review links

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The table shows the files in the content directory that were changed in this pull request. This helps you review your changes on a staging server. Changes to the data directory are not included in this table.

Source	Review	Production	What Changed
copilot/responsible-use/chat.md	fpt ghec	fpt ghec

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

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