Merge pull request #6467 from segmentio/prigiattiperrut-patch-4

anonymousId change when userId is sent to an empty string

Author: forstisabella

src/connections/sources/catalog/libraries/website/javascript/identity.md

@@ -58,6 +58,7 @@ A user's `anonymousId` changes when any of the following conditions are met.
 - The user clears their cookies _and_ `localstorage`.
 - Your site or app calls [`analytics.reset()`](/docs/connections/sources/catalog/libraries/website/javascript/#reset-or-logout) during in the user's browser session.
 - Your site or app calls `analytics.identify()` with a userId that is different from the current userId.
+- Your site or app is setting ajs_user_id to an empty string or calling `analytics.user().id('')`.
 
 
 ### Override the Anonymous ID from the Segment snippet