Wrong version for kn create kafka channel

[Leo6Leo]

client/docs/cmd/kn_channel_create.md

Line 22 in ae35736

kn channel create k1 --type messaging.knative.dev:v1alpha1:KafkaChannel

The version here should be v1beta1 as we can refer to here

[Leo6Leo]

/cc @Cali0707

[Cali0707]

Thanks for reporting @Leo6Leo

[Cali0707]

/good-first-issue

[knative-prow]

@Cali0707:
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[Cali0707]

It also shows up here:

client/pkg/kn/flags/channel_types.go

Line 57 in ae35736

"Examples: '--type messaging.knative.dev:v1alpha1:KafkaChannel' for specifying explicit Group:Version:Kind.")

[MeenuyD]

/assign

[Cali0707]

Thanks for finishing this @MeenuyD !! 🎉