I ran aspell through the files and found below to be typos while manually filtering the aspell output. I have classified it into sections since I am not sure if code comments are worth fixing and added relevant files where they are present. I am tagging the issue for PyCon US dev sprints. Please don't make a PR for this if you have already contributed a PR.

# Docs folder

Cotnent -> Content-Transfer-Encoding (Doc/library/email.generator.rst)
attibute -> attribute (Doc/library/pyclbr.rst)
milleseconds -> milliseconds (Doc/library/idle.rst)

# Code comments

actuall -> actual (Lib/test/test_dataclasses.py)
actully -> actually (Lib/contextlib.py)
agains -> against (Lib/pathlib.py)
Amerian -> American (Lib/test/test_random.py)
Conflic -> Conflict (Lib/idlelib/idle_test/test_config.py)
Depedent -> Dependent (Lib/test/datetimetester.py)
Diffent -> Different (Lib/test/support/__init__.py)
Diplay -> Display (Objects/object.c)
Doens't -> Doesn't (Lib/test/test_ssl.py)
Dono't -> Don't (Lib/test/test_importlib/test_lazy.py)
intermitted -> intermittent (Lib/test/pickletester.py)
invokation -> Invocation (Lib/platform.py)
occuring -> occurring (Lib/test/test_tools/test_i18n.py)
permuations -> permutations (Lib/tokenize.py)
resouce -> resource (Lib/multiprocessing/resource_sharer.py)
statists -> statistics (Lib/pstats.py)

# Docstring

Dafault -> Default (Lib/turtle.py)
Diplay -> Display (Lib/idlelib/help.py)
Intput -> Input (Lib/lib2to3/pgen2/tokenize.py)
milleseconds -> milliseconds (Lib/idlelib/configdialog.py, Lib/idlelib/help.html)