Don't use arrow functions with Flow types to fix website generation

Summary:
Our custom jsdocs parser doesn't support the syntax yet.

public

Reviewed By: bestander

Differential Revision: D2739861

fb-gh-sync-id: eefc3c54b98e06597ca7d93396aa4fe3a92d4a58

Author: Martin Konicek

Examples/UIExplorer/NetInfoExample.js

@@ -176,7 +176,7 @@ exports.examples = [
   {
     platform: 'android',
     title: 'NetInfo.isConnectionExpensive (Android)',
-    description: 'Asycnronously check isConnectionExpensive',
+    description: 'Asynchronously check isConnectionExpensive',
     render(): ReactElement { return <IsConnectionExpensive />; }
   },
 ];

Libraries/Network/NetInfo.js

@@ -58,11 +58,15 @@ const _subscriptions = new Map();
 
 let _isConnected;
 if (Platform.OS === 'ios') {
-  _isConnected = (reachability: ReachabilityStateIOS): bool => {
+  _isConnected = function(
+    reachability: ReachabilityStateIOS,
+  ): bool {
     return reachability !== 'none' && reachability !== 'unknown';
   };
 } else if (Platform.OS === 'android') {
-  _isConnected = (connectionType: ConnectivityStateAndroid) : bool => {
+  _isConnected = function(
+      connectionType: ConnectivityStateAndroid,
+    ): bool {
     return connectionType !== 'NONE' && connectionType !== 'UNKNOWN';
   };
 }