fix deploying databend on k8s add namespace databend-meta

Author: bjm1244

docs/cn/guides/10-deploy/01-deploy/02-production/02-deploying-databend-on-kubernetes.md

@@ -248,6 +248,7 @@ config:
   meta:
     # Set endpoints to use remote meta service
     # depends on previous deployed meta service、namespace and nodes
+    namespace: "databend-meta"
     endpoints:
       - "databend-meta-0.databend-meta.databend-meta.svc:9191"
       - "databend-meta-1.databend-meta.databend-meta.svc:9191"

docs/en/guides/10-deploy/01-deploy/02-production/02-deploying-databend-on-kubernetes.md

@@ -250,6 +250,7 @@ config:
   meta:
     # Set endpoints to use remote meta service
     # depends on previous deployed meta service、namespace and nodes
+    namespace: "databend-meta"
     endpoints:
       - "databend-meta-0.databend-meta.databend-meta.svc:9191"
       - "databend-meta-1.databend-meta.databend-meta.svc:9191"