docs: tweak TODOs

Author: vchudnov-g

google/api_core/__init__.py

@@ -23,7 +23,7 @@
 
 __version__ = api_core_version.__version__
 
-# TODO: Until dependent artifacts require this version of
+# NOTE: Until dependent artifacts require this version of
 # google.api_core, the functionality below must be made available
 # manually in those artifacts.
 

google/api_core/_python_package_support.py

@@ -47,7 +47,8 @@ def get_dependency_version(dependency_name: str) -> Optional[PackagingVersion]:
             version_string = metadata.version(dependency_name)
             return parse_version(version_string)
 
-        # TODO: Remove this code path once we drop support for Python 3.7
+        # TODO(https://github.com/googleapis/python-api-core/issues/835): Remove
+        # this code path once we drop support for Python 3.7
         else:
             # Use pkg_resources, which is part of setuptools.
             import pkg_resources