[guide] [react] Add examples for formatting multiline conditional components

Author: heyitaki

react/README.md

@@ -214,6 +214,27 @@ This style guide is mostly based on the standards that are currently prevalent i
 
     // good
     {showButton && <Button />}
+
+    // good
+    {someReallyLongConditional
+      && anotherLongConditional
+      && (
+        <Foo
+          superLongParam="bar"
+          anotherSuperLongParam="baz"
+        />
+      )
+    }
+
+    // good
+    {someConditional ? (
+      <Foo />
+    ) : (
+      <Foo
+        superLongParam="bar"
+        anotherSuperLongParam="baz"
+      />
+    )}
     ```
 
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