Corrected typo in comment.

Lib/logging/__init__.py

@@ -480,7 +480,7 @@ class Formatter(object):
                 # to errors when s is Unicode and record.exc_text is str
                 # See issue 8924.
                 # We also use replace for when there are multiple
-                # encodings, e.g. UTF-898 for the filesystem and latin-1
+                # encodings, e.g. UTF-8 for the filesystem and latin-1
                 # for a script. See issue 13232.
                 s = s + record.exc_text.decode(sys.getfilesystemencoding(),
                                                'replace')