Fix typo.

Author: kshetline

CHANGELOG.md

@@ -1,7 +1,7 @@
 ## 3.8.0
 
 * Major new feature: Air quality current conditions and forecast.
-* Update button is Settings dialog (if admin features are enabled) is now functional even when an updated software version is not pending, as a convenient way to reinstall the software and/or change installation options.
+* Update button in Settings dialog (if admin features are enabled) is now functional even when an updated software version is not pending, as a convenient way to reinstall the software and/or change installation options.
 * Better handling of an unresponsive FTP connection used (as one option) for retrieving leap second info.
 
 ## 3.7.3