Update network.md to fix typo (facebook#4184)

Author: dafrito

docs/network.md

@@ -181,7 +181,7 @@ export default App;
 </TabItem>
 </Tabs>
 
-> By default, iOS 9.0 or later enforce App Transport Secruity (ATS). ATS requires any HTTP connection to use HTTPS. If you need to fetch from a cleartext URL (one that begins with `http`) you will first need to [add an ATS exception](integration-with-existing-apps.md#test-your-integration). If you know ahead of time what domains you will need access to, it is more secure to add exceptions only for those domains; if the domains are not known until runtime you can [disable ATS completely](publishing-to-app-store.md#1-enable-app-transport-security). Note however that from January 2017, [Apple's App Store review will require reasonable justification for disabling ATS](https://forums.developer.apple.com/thread/48979). See [Apple's documentation](https://developer.apple.com/library/ios/documentation/General/Reference/InfoPlistKeyReference/Articles/CocoaKeys.html#//apple_ref/doc/uid/TP40009251-SW33) for more information.
+> By default, iOS 9.0 or later enforce App Transport Security (ATS). ATS requires any HTTP connection to use HTTPS. If you need to fetch from a cleartext URL (one that begins with `http`) you will first need to [add an ATS exception](integration-with-existing-apps.md#test-your-integration). If you know ahead of time what domains you will need access to, it is more secure to add exceptions only for those domains; if the domains are not known until runtime you can [disable ATS completely](publishing-to-app-store.md#1-enable-app-transport-security). Note however that from January 2017, [Apple's App Store review will require reasonable justification for disabling ATS](https://forums.developer.apple.com/thread/48979). See [Apple's documentation](https://developer.apple.com/library/ios/documentation/General/Reference/InfoPlistKeyReference/Articles/CocoaKeys.html#//apple_ref/doc/uid/TP40009251-SW33) for more information.
 
 > On Android, as of API Level 28, clear text traffic is also blocked by default. This behaviour can be overridden by setting [`android:usesCleartextTraffic`](https://developer.android.com/guide/topics/manifest/application-element#usesCleartextTraffic) in the app manifest file.