Remove encouraging comments

These comments are relevant to this function, since it is long
overdue for refactoring. This code isn't special in that regard, and we
should feel free to consider any piece of code eligible to be broken up
or put into a class. So we remove these comments in fairness to the rest
of the code, and to remove a distraction during upcoming code reviews.

src/pip/_internal/operations/install/wheel.py

@@ -352,10 +352,6 @@ def install_unpacked_wheel(
           Wheel-Version
         * when the .dist-info dir does not match the wheel
     """
-    # TODO: Investigate and break this up.
-    # TODO: Look into moving this into a dedicated class for representing an
-    #       installation.
-
     source = wheeldir.rstrip(os.path.sep) + os.path.sep
 
     info_dir, metadata = parse_wheel(wheel_zip, name)