Un-deprecate "view_search_results" event for iOS.

PiperOrigin-RevId: 311374094

Author: Googler

analytics/ios_headers/FIREventNames.h

@@ -383,7 +383,6 @@ static NSString *const kFIREventViewItemList NS_SWIFT_NAME(AnalyticsEventViewIte
 /// <ul>
 ///     <li>@c kFIRParameterSearchTerm (NSString)</li>
 /// </ul>
-/// <b>This constant has been deprecated.</b>
 static NSString *const kFIREventViewSearchResults NS_SWIFT_NAME(AnalyticsEventViewSearchResults) =
     @"view_search_results";