Chatter in Apex Name Change

We renamed Chatter in Apex to Connect in Apex to better reflect the nature of the methods in the ConnectApi namespace.

Where: This change applies to Lightning Experience, Salesforce Classic, and all versions of the mobile app in every edition, except Personal.

Why: The ConnectApi namespace supports many features outside of Chatter. For example, this release introduces 40 B2B Commerce on Lightning methods and many more non-Chatter classes. We wanted a name that better represents all the non-Chatter methods and classes.