fix another typo

sudodaksh · web-flow · commit a31aedbd4a3d · 2018-10-19T14:50:16.000+05:30
diff --git a/src/vs/platform/theme/common/themeService.ts b/src/vs/platform/theme/common/themeService.ts
@@ -55,7 +55,7 @@ export interface ITheme {
 	getColor(color: ColorIdentifier, useDefault?: boolean): Color | null;
 
 	/**
-	 * Returns wheter the theme defines a value for the color. If not, that means the
+	 * Returns whether the theme defines a value for the color. If not, that means the
 	 * default color will be used.
 	 */
 	defines(color: ColorIdentifier): boolean;
@@ -137,4 +137,4 @@ platform.Registry.add(Extensions.ThemingContribution, themingRegistry);
 
 export function registerThemingParticipant(participant: IThemingParticipant): IDisposable {
 	return themingRegistry.onThemeChange(participant);
-}
+}
