Personalization API docs not cross-linked to Client Side API docs

[kadamwhite]

It is easy to end up on https://github.com/humanmade/altis-analytics/blob/master/docs/optimization-framework/personalization.md while researching personalization, but the Altis.Analytics.on() function may not be available because, as the client side docs clarify, the analytics script which defines on is async and may load late. There should be a cross-link from the personalization docs to the client side API docs.

Acceptance criteria:

• personalization.md links to the client-side API documentation.