Fix a few grammar problems in the documentation and comments
diff --git a/Lib/doctest.py b/Lib/doctest.py
index 64e6d71..432ef05 100644
--- a/Lib/doctest.py
+++ b/Lib/doctest.py
@@ -1573,7 +1573,7 @@
# If `want` contains hex-escaped character such as "\u1234",
# then `want` is a string of six characters(e.g. [\,u,1,2,3,4]).
- # On the other hand, `got` could be an another sequence of
+ # On the other hand, `got` could be another sequence of
# characters such as [\u1234], so `want` and `got` should
# be folded to hex-escaped ASCII string to compare.
got = self._toAscii(got)