docs: fix changelog

docs/changelog.rst

@@ -54,8 +54,9 @@ Enhancements
   seconds compared to vanilla.
 
 * `49736b3a <https://github.com/dw/mitogen/commit/49736b3a>`_: avoid a
-  roundtrip when transferring files larger than 124KiB, in between waiting for
-  the transfer to complete and start of the follow-up action..
+  roundtrip when transferring files larger than 124KiB, avoiding a delay
+  between waiting for the transfer to complete and start of the follow-up
+  action.
 
 * `d62e6e2a <https://github.com/dw/mitogen/commit/d62e6e2a>`_: many-target
   runs executed the dependency scanner redundantly due to missing