Spelling fixes to docs, docstrings, and comments (GH-6374)

diff --git a/Lib/test/test__xxsubinterpreters.py b/Lib/test/test__xxsubinterpreters.py
index 397d359..4ef7771 100644
--- a/Lib/test/test__xxsubinterpreters.py
+++ b/Lib/test/test__xxsubinterpreters.py
@@ -1001,7 +1001,7 @@
             interpreters.channel_recv(cid)
 
     def test_drop_partially(self):
-        # XXX Is partial close too wierd/confusing?
+        # XXX Is partial close too weird/confusing?
         cid = interpreters.channel_create()
         interpreters.channel_send(cid, None)
         interpreters.channel_recv(cid)