Docs: Correct reference to missing MacOS profile

[trumant]

Observed Behavior

As a newcomer to the project, I was reading https://github.com/ocsf/ocsf-schema/blob/main/extensions.md?plain=1#L19 and expected to find a directory named macos in https://github.com/ocsf/ocsf-schema/tree/main/extensions but I did not.

Expected Behavior

https://github.com/ocsf/ocsf-schema/blob/main/extensions.md?plain=1#L19 either does not mention a missing extension or the document is otherwise clarified to set the appropriate expectations for the reader as to the presence or absence of an extension specific to MacOS.

[pagbabian-splunk]

Yes, there was a MacOS extension during one of the version cycles, but before the official release of that version, the author removed the extension and refactored the event as a core event (for what was then Startup Item Query - now deprecated in favor of the Query Evidence object and Live Evidence: https://schema.ocsf.io/1.5.0/objects/query_evidence?extensions=)

However, we will likely be adding it back in 1.6 (more discussion required) for other purposes. Sorry for the confusion this may have created.