Fix typos

Doc/library/calendar.rst

@@ -16,7 +16,7 @@ the week to Sunday (6) or to any other weekday.  Parameters that specify dates
 are given as integers. For related
 functionality, see also the :mod:`datetime` and :mod:`time` modules.
 
-Most of these functions and classses rely on the :mod:`datetime` module which
+Most of these functions and classes rely on the :mod:`datetime` module which
 uses an idealized calendar, the current Gregorian calendar indefinitely extended
 in both directions.  This matches the definition of the "proleptic Gregorian"
 calendar in Dershowitz and Reingold's book "Calendrical Calculations", where

Doc/library/unittest.rst

@@ -273,7 +273,7 @@ The ``discover`` sub-command has the following options:
    -t directory     Top level directory of project (default to
                     start directory)
 
-The -s, -p, & -t options can be passsed in as positional arguments. The
+The -s, -p, & -t options can be passed in as positional arguments. The
 following two command lines are equivalent::
 
    python -m unittest discover -s project_directory -p '*_test.py'