docs: Fix formatting of request arg in docstring (#186)

* docs: Fix formatting of request arg in docstring

chore: Update gapic-generator-python to v1.9.1
PiperOrigin-RevId: 518604533

Source-Link: googleapis/googleapis@8a085ae

Source-Link: googleapis/googleapis-gen@b2ab4b0
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* 🦉 Updates from OwlBot post-processor

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google/cloud/privatecatalog_v1beta1/services/private_catalog/transports/rest.py

@@ -308,7 +308,6 @@ def __call__(
                 request (~.private_catalog.SearchCatalogsRequest):
                     The request object. Request message for
                 [PrivateCatalog.SearchCatalogs][google.cloud.privatecatalog.v1beta1.PrivateCatalog.SearchCatalogs].
-
                 retry (google.api_core.retry.Retry): Designation of what errors, if any,
                     should be retried.
                 timeout (float): The timeout for this request.
@@ -406,7 +405,6 @@ def __call__(
                 request (~.private_catalog.SearchProductsRequest):
                     The request object. Request message for
                 [PrivateCatalog.SearchProducts][google.cloud.privatecatalog.v1beta1.PrivateCatalog.SearchProducts].
-
                 retry (google.api_core.retry.Retry): Designation of what errors, if any,
                     should be retried.
                 timeout (float): The timeout for this request.
@@ -506,7 +504,6 @@ def __call__(
                 request (~.private_catalog.SearchVersionsRequest):
                     The request object. Request message for
                 [PrivateCatalog.SearchVersions][google.cloud.privatecatalog.v1beta1.PrivateCatalog.SearchVersions].
-
                 retry (google.api_core.retry.Retry): Designation of what errors, if any,
                     should be retried.
                 timeout (float): The timeout for this request.