[2.7] Fix typos in multiple `.rst` files (GH-1668) (#1707)

diff --git a/Doc/library/email.mime.rst b/Doc/library/email.mime.rst
index dcf7b59..5cbb4dd 100644
--- a/Doc/library/email.mime.rst
+++ b/Doc/library/email.mime.rst
@@ -210,7 +210,7 @@
 
    Unless the ``_charset`` parameter is explicitly set to ``None``, the
    MIMEText object created will have both a :mailheader:`Content-Type` header
-   with a ``charset`` parameter, and a :mailheader:`Content-Transfer-Endcoding`
+   with a ``charset`` parameter, and a :mailheader:`Content-Transfer-Encoding`
    header.  This means that a subsequent ``set_payload`` call will not result
    in an encoded payload, even if a charset is passed in the ``set_payload``
    command.  You can "reset" this behavior by deleting the
diff --git a/Doc/library/sunau.rst b/Doc/library/sunau.rst
index 5d57d4b..5bf4803 100644
--- a/Doc/library/sunau.rst
+++ b/Doc/library/sunau.rst
@@ -117,7 +117,7 @@
 
 .. method:: AU_read.getnchannels()
 
-   Returns number of audio channels (1 for mone, 2 for stereo).
+   Returns number of audio channels (1 for mono, 2 for stereo).
 
 
 .. method:: AU_read.getsampwidth()