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)

I'd like to work on this for the mentored Sprints

New changeset 964663089547ca110199e23867b46b07ff4be88c by Stéphane Wirtel (penguindustin) in branch 'master':
bpo-36766: Typos in docs and code comments (GH-13116)
https://github.com/python/cpython/commit/964663089547ca110199e23867b46b07ff4be88c

Please do not close this until at least the idlelib changes are backported.

Hi Terry,

Sure, thank you for the reminder.

New changeset b2d29bfa5be5a0794c7c69078c43953967fcacf4 by Miss Islington (bot) (penguindustin) in branch '3.7':
[3.7] bpo-36766: Typos in docs and code comments (GH-13116). (GH-13136)
https://github.com/python/cpython/commit/b2d29bfa5be5a0794c7c69078c43953967fcacf4

Dustin, thank you for both patches.  Some people are not annoyed by minor typos.  I am one who is.  I hope you are enjoying and learning from the sprint.