Fix idlelib typos discovered by min ho, pr 15018. (GH-15029)

diff --git a/Lib/idlelib/NEWS.txt b/Lib/idlelib/NEWS.txt
index 109b2d5..e9a9b02 100644
--- a/Lib/idlelib/NEWS.txt
+++ b/Lib/idlelib/NEWS.txt
@@ -38,7 +38,7 @@
 bpo-37321: Both subprocess connection error messages now refer to
 the 'Startup failure' section of the IDLE doc.
 
-bpo-37039: Adjust "Zoom Height" to individual screens by momemtarily
+bpo-37039: Adjust "Zoom Height" to individual screens by momentarily
 maximizing the window on first use with a particular screen.  Changing
 screen settings may invalidate the saved height.  While a window is
 maximized, "Zoom Height" has no effect.