Issue #27076: Doc, comment and test function name spelling fixes

Most fixes to Doc/ and Lib/ directories by Ville Skyttä.
diff --git a/Lib/test/test_zipfile.py b/Lib/test/test_zipfile.py
index 40033f2..4000b30 100644
--- a/Lib/test/test_zipfile.py
+++ b/Lib/test/test_zipfile.py
@@ -184,7 +184,7 @@
         for f in (TESTFN2, TemporaryFile(), StringIO()):
             self.zip_random_open_test(f, zipfile.ZIP_STORED)
 
-    def test_univeral_readaheads(self):
+    def test_universal_readaheads(self):
         f = StringIO()
 
         data = 'a\r\n' * 16 * 1024