Make comments more respectful in pylintrc.

I would like to also remove `[MASTER]` but this would require an upstream change
in pylint [0] since there is no current alternative.

[0] https://github.com/PyCQA/pylint/blob/98d2c060ba0dbae6abecff2393cb6dd8a9bde97b/pylint/constants.py#L32-L35

PiperOrigin-RevId: 354072752
Change-Id: I7e5ca28a2864dc118e1244cce136462cc799e57f

Author: tomhennigan

.pylintrc

@@ -5,13 +5,14 @@
 # Its canonical open-source location is:
 #   https://google.github.io/styleguide/pylintrc
 
+# TODO(b/178199529): Replace section header when pylint is updated.
 [MASTER]
 
-# Add files or directories to the blacklist. They should be base names, not
+# Add files or directories to the ban list. They should be base names, not
 # paths.
 ignore=third_party
 
-# Add files or directories matching the regex patterns to the blacklist. The
+# Add files or directories matching the regex patterns to the ban list. The
 # regex matches against base names, not paths.
 ignore-patterns=
 
@@ -29,11 +30,6 @@ jobs=4
 # active Python interpreter and may run arbitrary code.
 unsafe-load-any-extension=no
 
-# A comma-separated list of package or module names from where C extensions may
-# be loaded. Extensions are loading into the active Python interpreter and may
-# run arbitrary code
-extension-pkg-whitelist=
-
 
 [MESSAGES CONTROL]