bpo-36766: Typos in docs and code comments (GH-13116)

diff --git a/Lib/lib2to3/pgen2/tokenize.py b/Lib/lib2to3/pgen2/tokenize.py
index c07b34f..279d322 100644
--- a/Lib/lib2to3/pgen2/tokenize.py
+++ b/Lib/lib2to3/pgen2/tokenize.py
@@ -321,7 +321,7 @@
     Round-trip invariant for full input:
         Untokenized source will match input source exactly
 
-    Round-trip invariant for limited intput:
+    Round-trip invariant for limited input:
         # Output text will tokenize the back to the input
         t1 = [tok[:2] for tok in generate_tokens(f.readline)]
         newcode = untokenize(t1)