APM known issue correction

[inge4pres]

Description

Amend APM known issue with the version delivering the fix

Documentation sets edited in this PR

Check all that apply.

• Stateful (docs/en/observability/*)
• Serverless (docs/en/serverless/*)
• Integrations Developer Guide (docs/en/integrations/*)
• None of the above

Checklist

• Product/Engineering Review
• Writer Review

Follow-up tasks

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• This PR does not need to be ported to another doc set because:
  • The concepts in this PR only apply to one doc set (serverless or stateful)
  • The PR contains edits to both doc sets (serverless and stateful)
• This PR needs to be ported to another doc set:
  • Port to stateful docs: <link to PR or tracking issue>
  • Port to serverless docs: <link to PR or tracking issue>

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[colleenmcginnis]

Two minor suggestions:

• Be more specific about the affected versions now that there's a fix.
• Break into two lines (using a trailing + on the first line):

Before	After

Suggested change

	_Elastic Stack versions: 8.15.0+_
	_Fixed in Elastic Stack version 8.15.4_
	_Elastic Stack versions: 8.15.0, 8.15.1, 8.15.2, 8.15.3_ +
	_Fixed in Elastic Stack version 8.15.4_

[bmorelli25]

Thanks, @inge4pres! I'm going to merge @colleenmcginnis's suggestion into this PR and then cherry-pick both of your commits to #4501.

[bmorelli25]

Okay, changes have been moved over! Closing in favor of #4501.