docs(v1): Add image shortcut example for Batch HPC CentOS Image (#119)

* docs: Add image shortcut example for Batch HPC CentOS Image

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google/cloud/batch_v1/types/job.py

@@ -197,7 +197,7 @@ class State(proto.Enum):
 
         Values:
             STATE_UNSPECIFIED (0):
-                No description available.
+                Job state unspecified.
             QUEUED (1):
                 Job is admitted (validated and persisted) and
                 waiting for resources.
@@ -487,6 +487,7 @@ class Disk(proto.Message):
                 -  "batch-debian": use Batch Debian images.
                 -  "batch-centos": use Batch CentOS images.
                 -  "batch-cos": use Batch Container-Optimized images.
+                -  "batch-hpc-centos": use Batch HPC CentOS images.
 
                 This field is a member of `oneof`_ ``data_source``.
             snapshot (str):

samples/generated_samples/snippet_metadata_google.cloud.batch.v1.json

@@ -8,7 +8,7 @@
     ],
     "language": "PYTHON",
     "name": "google-cloud-batch",
-    "version": "0.12.0"
+    "version": "0.1.0"
   },
   "snippets": [
     {

samples/generated_samples/snippet_metadata_google.cloud.batch.v1alpha.json

@@ -8,7 +8,7 @@
     ],
     "language": "PYTHON",
     "name": "google-cloud-batch",
-    "version": "0.12.0"
+    "version": "0.1.0"
   },
   "snippets": [
     {