docs: header name with sampled flag

[sefiros1]

Fixed header name with sampled flag in docs.

Checklist

• Update documentation
• Commit message follows commit guidelines

[cla-checker-service]

💚 CLA has been signed

[apmmachine]

💚 Build Succeeded

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• Start Time: 2022-12-13T17:21:10.618+0000

• Duration: 3 min 3 sec

🤖 GitHub comments

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To re-run your PR in the CI, just comment with:

• /test : Re-trigger the build.

• run module tests for <modules> : Run TAV tests for one or more modules, where <modules> can be either a comma separated list of modules (e.g. memcached,redis) or the string literal ALL to test all modules

• run benchmark tests : Run the benchmark test only.

• run elasticsearch-ci/docs : Re-trigger the docs validation. (use unformatted text in the comment!)

[trentm]

@sefiros1 Though it is silly for this small change, are you able to sign our contributor agreement?

[trentm]

@elasticmachine, run elasticsearch-ci/docs

[sefiros1]

@trentm I signed right after I created the PR. Is there any way to restart the pipeline check?
I'm sorry about that, this is my first PR.

[trentm]

@sefiros1 Looks like the CLA-check went through. I didn't have to restart it, so I guess it was just delayed. Don't be sorry at all!

[trentm]

@sefiros1 Thanks!

[trentm]

Ah... this was against the '3.x' branch. This should have gone against the 'main' branch. My bad for not noticing this earlier. I've cherry-picked it into main.