fix spacing

Author: Chris Cho

source/whats-new.txt

@@ -50,9 +50,9 @@ What's New in 1.15
 
 The 1.15 {+driver-short+} release includes the following improvements and fixes:
 
-- Connection churn can be mitigated by setting a client-wide timeout by 
-  specifying the ``timeoutMS`` connection option or by calling the 
- `SetTimeout() <https://pkg.go.dev/go.mongodb.org/mongo-driver/mongo/options#ClientOptions.SetTimeout>`__
+- Connection churn can be mitigated by setting a client-wide timeout by
+  specifying the ``timeoutMS`` connection option or by calling the
+  `SetTimeout() <https://pkg.go.dev/go.mongodb.org/mongo-driver/mongo/options#ClientOptions.SetTimeout>`__
   function. When the timeout is set, the driver attempts to reuse a connection
   after an operation times out and waits for up to one second to check if
   the connection can be reused before closing it.