Updated the docs for Knative Operator 1.21 (#6563)

Author: Vincent

docs/versioned/install/operator/knative-with-operators.md

@@ -699,9 +699,9 @@ ko delete -f config/
 
 The following table describes the supported versions of Serving and Eventing for the Knative Operator:
 
-| Operator | Serving                                                                                                                                                 | Eventing                                                                                                                                                                                                               |
-|----------|---------------------------------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
-| v1.20    | v1.20.0<br/>v1.19.0, v1.19.1, v1.19.2, v1.19.3, v1.19.4, v1.19.5, v1.19.6 and v1.19.7<br/>v1.18.0, v1.18.1 and v1.18.2<br/>v1.17.0, v1.17.1 and v1.17.2 | v1.20.0<br/>v1.19.0, v1.19.1, v1.19.2, v1.19.3, v1.19.4, v1.19.5, v1.19.6, v1.19.7 and v1.19.8<br/>v1.18.0, v1.18.1, v1.18.2, v1.18.3 and v1.18.4<br/>v1.17.0, v1.17.1, v1.17.2, v1.17.3, v1.17.4, v1.17.5 and v1.17.6 |
+| Operator | Serving                                                                                                                                                                   | Eventing                                                                                                                                                                  |
+|----------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+| v1.21    | v1.21.0<br/>v1.20.0, v1.20.1 and v1.20.2<br/>v1.19.0, v1.19.1, v1.19.2, v1.19.3, v1.19.4, v1.19.5, v1.19.6, v1.19.7, v1.19.8 and v1.19.9<br/>v1.18.0, v1.18.1 and v1.18.2 | v1.21.0<br/>v1.20.0 and v1.20.1<br/>v1.19.0, v1.19.1, v1.19.2, v1.19.3, v1.19.4, v1.19.5, v1.19.6, v1.19.7 and v1.19.8<br/>v1.18.0, v1.18.1, v1.18.2, v1.18.3 and v1.18.4 |
 
 ## What's next