[3.6] Fix typos in multiple `.rst` files (GH-1668) (#1702)

(cherry picked from commit 3378b2062c7fbb77a9b5e6d315d6b94160fac69a)
diff --git a/Doc/library/email.errors.rst b/Doc/library/email.errors.rst
index 2d0d192..5838767 100644
--- a/Doc/library/email.errors.rst
+++ b/Doc/library/email.errors.rst
@@ -102,9 +102,9 @@
   return false even though its content type claims to be :mimetype:`multipart`.
 
 * :class:`InvalidBase64PaddingDefect` -- When decoding a block of base64
-  enocded bytes, the padding was not correct.  Enough padding is added to
+  encoded bytes, the padding was not correct.  Enough padding is added to
   perform the decode, but the resulting decoded bytes may be invalid.
 
 * :class:`InvalidBase64CharactersDefect` -- When decoding a block of base64
-  enocded bytes, characters outside the base64 alphebet were encountered.
+  encoded bytes, characters outside the base64 alphabet were encountered.
   The characters are ignored, but the resulting decoded bytes may be invalid.