docs: update crd version

[Gallardot]

Type of change:

• Bugfix
• New feature provided
• Improve performance
• Backport patches

What this PR does / why we need it:

Pre-submission checklist:

• Did you explain what problem does this PR solve? Or what new features have been added?
• Have you added corresponding test cases?
• Have you modified the corresponding document?
• Is this PR backward compatible? If it is not backward compatible, please discuss on the mailing list first

[tao12345666333]

Thanks for your contribution,
But I hope you can modify other related content at the same time.

Modify the API version in the following documents to v2beta3 .
And note that in case of ApisixRoute resource, we have removed the spec.http.backend field and need to update it to spec.http.backends

docs/en/latest/tutorials/proxy-grpc-service.md
109:apiVersion: apisix.apache.org/v1
137:apiVersion: apisix.apache.org/v1

docs/en/latest/tutorials/mtls/tls.yaml
17:apiVersion: apisix.apache.org/v1

docs/en/latest/tutorials/mtls/mtls.yaml
17:apiVersion: apisix.apache.org/v1

docs/en/latest/concepts/apisix_upstream.md
35:apiVersion: apisix.apache.org/v1
61:apiVersion: apisix.apache.org/v1
80:apiVersion: apisix.apache.org/v1
131:apiVersion: apisix.apache.org/v1
143:apiVersion: apisix.apache.org/v1
162:apiVersion: apisix.apache.org/v1

docs/en/latest/concepts/apisix_tls.md
30:apiVersion: apisix.apache.org/v1

and

docs/en/latest/concepts/apisix_cluster_config.md
38:apiVersion: apisix.apache.org/v2alpha1
61:apiVersion: apisix.apache.org/v2alpha1

[AlinsRan]

About this Ci error #1137, you need to merge the latest code.

[tao12345666333]

When you change spec.http.backend to spec.http.backends , you should add - before serviceName. Because its a sequence(list)

Thanks!

[tao12345666333]

LGTM

[juzhiyuan]

Thanks! Don't forget to update this PR's template :)

[tao12345666333]

LGTM