[7.x] [ML] Add doc link for classification AUC ROC evaluation (#86660)

[lcawl]

Backports the following commits to 7.x:

• [ML] Add doc link for classification AUC ROC evaluation ([ML] Add doc link for classification AUC ROC evaluation #86660)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: 9dbb966

Metrics [docs]

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
triggersActionsUi	1.6MB	1.5MB	-26.9KB

Page load bundle

Size of the bundles that are downloaded on every page load. Target size is below 100kb

id	before	after	diff
core	555.9KB	556.1KB	+166.0B
triggersActionsUi	162.6KB	162.7KB	+102.0B
total			+268.0B

Unknown metric groups

async chunk count

id	before	after	diff
triggersActionsUi	31	32	+1

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