bpo-44514: Add doctest testcleanup for configparser and bz2 (#26909)

Add testcleanup section to configparser and bz2 documentation which
removes temporary files created in the filesystem when 'make doctest'
is run.

Doc/library/bz2.rst

@@ -325,3 +325,8 @@ Writing and reading a bzip2-compressed file in binary mode:
     ...     content = f.read()
     >>> content == data  # Check equality to original object after round-trip
     True
+
+.. testcleanup::
+
+   import os
+   os.remove("myfile.bz2")

Doc/library/configparser.rst

@@ -46,6 +46,11 @@ can be customized by end users easily.
 
    import configparser
 
+.. testcleanup::
+
+   import os
+   os.remove("example.ini")
+
 
 Quick Start
 -----------