More precise terminology

apps/rush-lib/src/cli/scriptActions/BulkScriptAction.ts

@@ -399,7 +399,7 @@ export class BulkScriptAction extends BaseScriptAction {
         'Normally Rush would terminate after the command finishes;' +
         ' adding this parameter will instead watch the file system for changes to the selected projects' +
         ' (or all projects if no selection was specified).' +
-        ' If changes are detected, will re-execute the command on all projects within the selection that are' +
+        ' When changes are detected, will re-execute the command on all projects within the selection that are' +
         ' impacted by the detected changes, then resume waiting for changes.' +
         ' For details, refer to the website article "Using watch mode".'
     });