feat: removed OPTIONAL for speech model variant feat: supported the knowledge base in knowledge operation metadata docs: added more docs for speech model variant and improved docs format for participant

PiperOrigin-RevId: 416079874

Source-Link: googleapis/googleapis@18c59ec

Source-Link: https://github.com/googleapis/googleapis-gen/commit/20123bec36a248ac0e352b11854b85fa6c42d57d
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiMjAxMjNiZWMzNmEyNDhhYzBlMzUyYjExODU0Yjg1ZmE2YzQyZDU3ZCJ9

Author: gcf-owl-bot[bot]

owl-bot-staging/v2/.coveragerc

@@ -0,0 +1,17 @@
+[run]
+branch = True
+
+[report]
+show_missing = True
+omit =
+    google/cloud/dialogflow/__init__.py
+exclude_lines =
+    # Re-enable the standard pragma
+    pragma: NO COVER
+    # Ignore debug-only repr
+    def __repr__
+    # Ignore pkg_resources exceptions.
+    # This is added at the module level as a safeguard for if someone
+    # generates the code and tries to run it without pip installing. This
+    # makes it virtually impossible to test properly.
+    except pkg_resources.DistributionNotFound

owl-bot-staging/v2/MANIFEST.in

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+recursive-include google/cloud/dialogflow *.py
+recursive-include google/cloud/dialogflow_v2 *.py

owl-bot-staging/v2/README.rst

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+Python Client for Google Cloud Dialogflow API
+=================================================
+
+Quick Start
+-----------
+
+In order to use this library, you first need to go through the following steps:
+
+1. `Select or create a Cloud Platform project.`_
+2. `Enable billing for your project.`_
+3. Enable the Google Cloud Dialogflow API.
+4. `Setup Authentication.`_
+
+.. _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
+.. _Setup Authentication.: https://googleapis.dev/python/google-api-core/latest/auth.html
+
+Installation
+~~~~~~~~~~~~
+
+Install this library in a `virtualenv`_ using pip. `virtualenv`_ is a tool to
+create isolated Python environments. The basic problem it addresses is one of
+dependencies and versions, and indirectly permissions.
+
+With `virtualenv`_, it's possible to install this library without needing system
+install permissions, and without clashing with the installed system
+dependencies.
+
+.. _`virtualenv`: https://virtualenv.pypa.io/en/latest/
+
+
+Mac/Linux
+^^^^^^^^^
+
+.. code-block:: console
+
+    python3 -m venv <your-env>
+    source <your-env>/bin/activate
+    <your-env>/bin/pip install /path/to/library
+
+
+Windows
+^^^^^^^
+
+.. code-block:: console
+
+    python3 -m venv <your-env>
+    <your-env>\Scripts\activate
+    <your-env>\Scripts\pip.exe install \path\to\library