Replace types boolean with bool.

Uses the command:

    ag -l 'type ([^:]+): boolean' | \
        xargs gsed -r -i.bak -e 's/type ([^:]+): boolean/type \1: bool/g'

packages/google-cloud-monitoring/google/cloud/monitoring/client.py

@@ -447,7 +447,7 @@ def group(self, group_id=None, display_name=None, parent_id=None,
             The filter string used to determine which monitored resources
             belong to this group.
 
-        :type is_cluster: boolean
+        :type is_cluster: bool
         :param is_cluster:
             If true, the members of this group are considered to be a cluster.
             The system can perform additional analysis on groups that are

packages/google-cloud-monitoring/google/cloud/monitoring/group.py

@@ -92,7 +92,7 @@ class Group(object):
         The filter string used to determine which monitored resources belong to
         this group.
 
-    :type is_cluster: boolean
+    :type is_cluster: bool
     :param is_cluster:
         If true, the members of this group are considered to be a cluster. The
         system can perform additional analysis on groups that are clusters.

packages/google-cloud-monitoring/google/cloud/monitoring/query.py

@@ -442,7 +442,7 @@ def iter(self, headers_only=False, page_size=None):
             for timeseries in query.iter():
                 ...
 
-        :type headers_only: boolean
+        :type headers_only: bool
         :param headers_only:
              Whether to omit the point data from the time series objects.
 
@@ -505,7 +505,7 @@ def _build_query_params(self, headers_only=False,
         We use a series of key-value pairs (suitable for passing to
         ``urlencode``) instead of a ``dict`` to allow for repeated fields.
 
-        :type headers_only: boolean
+        :type headers_only: bool
         :param headers_only:
              Whether to omit the point data from the
              :class:`~google.cloud.monitoring.timeseries.TimeSeries` objects.