bpo-41672: Fix type mismatches in imaplib docs (GH-22207)

diff --git a/Doc/library/imaplib.rst b/Doc/library/imaplib.rst
index 7c5b075..02ecfd9 100644
--- a/Doc/library/imaplib.rst
+++ b/Doc/library/imaplib.rst
@@ -143,7 +143,7 @@
 
 .. function:: Int2AP(num)
 
-   Converts an integer into a string representation using characters from the set
+   Converts an integer into a bytes representation using characters from the set
    [``A`` .. ``P``].
 
 
@@ -197,7 +197,7 @@
 
 Each command returns a tuple: ``(type, [data, ...])`` where *type* is usually
 ``'OK'`` or ``'NO'``, and *data* is either the text from the command response,
-or mandated results from the command. Each *data* is either a string, or a
+or mandated results from the command. Each *data* is either a ``bytes``, or a
 tuple. If a tuple, then the first part is the header of the response, and the
 second part contains the data (ie: 'literal' value).