chore: delete owlbot.py (#276)

* chore: delete owlbot.py

* 🦉 Updates from OwlBot

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

packages/google-cloud-dlp/.github/.OwlBot.lock.yaml

@@ -1,3 +1,3 @@
 docker:
   image: gcr.io/cloud-devrel-public-resources/owlbot-python:latest
-  digest: sha256:58f73ba196b5414782605236dd0712a73541b44ff2ff4d3a36ec41092dd6fa5b
+  digest: sha256:3f66ebf145a16bb07a2fcbdb79bcb5743a791e3dc46015b0de22cacdd2875f64

packages/google-cloud-dlp/docs/index.rst

@@ -2,31 +2,33 @@
 
 .. include:: multiprocessing.rst
 
-Api Reference
+
+API Reference
 -------------
 .. toctree::
     :maxdepth: 2
 
     dlp_v2/services
     dlp_v2/types
-    changelog
+
 
 Migration Guide
 ---------------
 
-See the guide below for instructions on migrating to the 2.x release of this library.
+See the guide below for instructions on migrating to the latest version.
 
 .. toctree::
     :maxdepth: 2
 
-    UPGRADING
+    UPGRADING
+
 
 Changelog
 ---------
 
 For a list of all ``google-cloud-dlp`` releases:
 
 .. toctree::
-  :maxdepth: 2
+    :maxdepth: 2
 
-  changelog
+    changelog

packages/google-cloud-dlp/noxfile.py

@@ -175,7 +175,7 @@ def cover(session):
     test runs (not system test runs), and then erases coverage data.
     """
     session.install("coverage", "pytest-cov")
-    session.run("coverage", "report", "--show-missing", "--fail-under=98")
+    session.run("coverage", "report", "--show-missing", "--fail-under=100")
 
     session.run("coverage", "erase")
 
@@ -190,7 +190,7 @@ def docs(session):
     shutil.rmtree(os.path.join("docs", "_build"), ignore_errors=True)
     session.run(
         "sphinx-build",
-        # "-W",  # warnings as errors
+        "-W",  # warnings as errors
         "-T",  # show full traceback on exception
         "-N",  # no colors
         "-b",