ceph: fix typos in ob doc
ceph: fix typos in ob doc

`phase` field name is not capitalized and its values are capitalized.
Here is an example.

```
apiVersion: objectbucket.io/v1alpha1
kind: ObjectBucketClaim
...
status:
  phase: Pending
```

Signed-off-by: Satoru Takeuchi <0be322b419f8cd46ee75447832ef0476dff222bc@gmail.com>

rook/nfs,rook/nfs,rook/rook,rook/nfs,rook/rook,rook/rook,rook/rook,rook/rook