bpo-34906: Doc: Fix typos (2) (GH-9735)

Fix typos
diff --git a/Misc/NEWS.d/3.5.0a3.rst b/Misc/NEWS.d/3.5.0a3.rst
index 2c62799..0e5d7c5 100644
--- a/Misc/NEWS.d/3.5.0a3.rst
+++ b/Misc/NEWS.d/3.5.0a3.rst
@@ -239,7 +239,7 @@
 .. nonce: pX2qrx
 .. section: Library
 
-Increase impalib's MAXLINE to accommodate modern mailbox sizes.
+Increase imaplib's MAXLINE to accommodate modern mailbox sizes.
 
 ..