API documentation: Fixing space new header line bug

[joshjohanning]

Why:

Before the line to add the API version header, the \ to signify a new line doesn't have a space after the previous header, so the request fails.

The doc page:

the error message:

{
"message": "A JSON web token could not be decoded",
"documentation_url": "https://docs.github.com/rest"
}
curl: (3) URL using bad/illegal format or missing URL

Adding a space works:

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

Adding a space in several spots in the docs where it is missing before the date/version header.

Check off the following:

• I have reviewed my changes in staging (look for the "Automatically generated comment" and click the links in the "Preview" column to view your latest changes).
• For content changes, I have completed the self-review checklist.

[github-actions]

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Content directory changes

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Source	Preview	Production	What Changed
apps/creating-github-apps/authenticating-with-a-github-app/authenticating-as-a-github-app-installation.md	fpt ghec ghes@ 3.8 3.7 3.6 3.5 3.4 ghae	fpt ghec ghes@ 3.8 3.7 3.6 3.5 3.4 ghae
apps/creating-github-apps/authenticating-with-a-github-app/authenticating-as-a-github-app.md	fpt ghec ghes@ 3.8 3.7 3.6 3.5 3.4 ghae	fpt ghec ghes@ 3.8 3.7 3.6 3.5 3.4 ghae
apps/creating-github-apps/authenticating-with-a-github-app/generating-a-json-web-token-jwt-for-a-github-app.md	fpt ghec ghes@ 3.8 3.7 3.6 3.5 3.4 ghae	fpt ghec ghes@ 3.8 3.7 3.6 3.5 3.4 ghae
rest/guides/getting-started-with-the-rest-api.md	fpt ghec ghes@ 3.8 3.7 3.6 3.5 3.4 ghae	fpt ghec ghes@ 3.8 3.7 3.6 3.5 3.4 ghae
rest/overview/authenticating-to-the-rest-api.md	fpt ghec ghes@ 3.8 3.7 3.6 3.5 3.4 ghae	fpt ghec ghes@ 3.8 3.7 3.6 3.5 3.4 ghae
rest/overview/resources-in-the-rest-api.md	fpt ghec ghes@ 3.8 3.7 3.6 3.5 3.4 ghae	fpt ghec ghes@ 3.8 3.7 3.6 3.5 3.4 ghae

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fpt: Free, Pro, Team
ghec: GitHub Enterprise Cloud
ghes: GitHub Enterprise Server
ghae: GitHub AE

[cmwilson21]

@joshjohanning Thanks so much for opening a PR! I'll get this triaged for review ⚡

[skedwards88]

🚀 Thank you for noticing and fixing this! We'll get this merged down for you.

[github-actions]

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