docs: fix formatting for reversed order field example (#831)

* docs: fix formatting for reversed order field example

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google/cloud/bigtable_v2/types/bigtable.py

@@ -86,8 +86,15 @@ class ReadRowsRequest(proto.Message):
 
             Return rows in lexiographical descending order of the row
             keys. The row contents will not be affected by this flag.
-            Example result set: [ {key: "k2", "f:col1": "v1", "f:col2":
-            "v1"}, {key: "k1", "f:col1": "v2", "f:col2": "v2"} ].
+
+            Example result set:
+
+            ::
+
+                [
+                  {key: "k2", "f:col1": "v1", "f:col2": "v1"},
+                  {key: "k1", "f:col1": "v2", "f:col2": "v2"}
+                ]
     """
 
     class RequestStatsView(proto.Enum):