[DOC] Remove LICENSE from possible endpoint list

[Jakob3xD]

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• Request a change to existing documentation
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Tell us about your request. Provide a summary of the request and all versions that are affected.
The endpoint LICENSE is currently listed as Endpoint but Opensearch complains when disabeling it.

plugins.security.restapi.endpoints_disabled.<some-role>.LICENSE: ["GET","PUT","POST","DELETE","PATCH"]

Unknown endpoint 'LICENSE' found in configuration, skipping.

https://opensearch.org/docs/latest/security/access-control/api/#access-control-for-the-api

What other resources are available?