Fix broken links in docs. (#9148)

Author: ryanyuan

packages/google-cloud-webrisk/README.rst

@@ -13,9 +13,9 @@ Python Client for Web Risk API (`Alpha`_)
 - `Product Documentation`_
 
 .. _Alpha: https://github.com/googleapis/google-cloud-python/blob/master/README.rst
-.. _Web Risk API: https://cloud.google.com/webrisk
+.. _Web Risk API: https://cloud.google.com/web-risk
 .. _Client Library Documentation: https://googleapis.dev/python/webrisk/latest
-.. _Product Documentation:  https://cloud.google.com/webrisk
+.. _Product Documentation:  https://cloud.google.com/web-risk
 
 Quick Start
 -----------
@@ -29,7 +29,7 @@ In order to use this library, you first need to go through the following steps:
 
 .. _Select or create a Cloud Platform project.: https://console.cloud.google.com/project
 .. _Enable billing for your project.: https://cloud.google.com/billing/docs/how-to/modify-project#enable_billing_for_a_project
-.. _Enable the Web Risk API.:  https://cloud.google.com/webrisk
+.. _Enable the Web Risk API.:  https://cloud.google.com/web-risk
 .. _Setup Authentication.: https://googleapis.dev/python/google-api-core/latest/auth.html
 
 Installation
@@ -77,5 +77,5 @@ Next Steps
 -  View this `repository’s main README`_ to see the full list of Cloud
    APIs that we cover.
 
-.. _Web Risk API Product documentation:  https://cloud.google.com/webrisk
+.. _Web Risk API Product documentation:  https://cloud.google.com/web-risk
 .. _repository’s main README: https://github.com/googleapis/google-cloud-python/blob/master/README.rst