Fix error in flow types

Summary:
Previously type Options had excludeActivityTypes property, but in RCTActionSheetManager.m and docs this property is named excludedActivityTypes.

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Want to fix error in flow types

Actually, it seems there aren't any need for test plan for this PR. Just fix a mistyping error.
Closes facebook#15881

Differential Revision: D5813539

Pulled By: ericnakagawa

fbshipit-source-id: 7d1269d4c177f920869bf6554f14af6db7a741ee

Libraries/Share/Share.js

@@ -22,7 +22,7 @@ const {
 } = require('NativeModules');
 
 type Content = { title?: string, message: string } | { title?: string, url: string };
-type Options = { dialogTitle?: string, excludeActivityTypes?: Array<string>, tintColor?: string };
+type Options = { dialogTitle?: string, excludedActivityTypes?: Array<string>, tintColor?: string };
 
 class Share {