Update API status documentation

Author: deliahu

docs/apis/statuses.md

@@ -4,15 +4,13 @@
 
 | Status               | Meaning |
 |----------------------|---|
-| ready                | API is deployed and ready to serve prediction requests |
-| pending              | API is waiting for another resource to be ready, or is initializing |
-| updating             | API is performing a rolling update |
-| update pending       | API will be updated when the new model is ready; a previous version of this API is ready |
+| live                 | API is deployed and ready to serve prediction requests (at least one replica is running) |
+| pending              | API is waiting for another resource to be ready |
+| creating             | API is being created |
 | stopping             | API is stopping |
 | stopped              | API is stopped |
 | error                | API was not created due to an error; run `cortex logs -v <name>` to view the logs |
 | skipped              | API was not created due to an error in another resource |
-| update skipped       | API was not updated due to an error in another resource; a previous version of this API is ready |
 | upstream error       | API was not created due to an error in one of its dependencies; a previous version of this API may be ready |
 | upstream termination | API was not created because one of its dependencies was terminated; a previous version of this API may be ready |
 | compute unavailable  | API could not start due to insufficient memory, CPU, or GPU in the cluster; some replicas may be ready |