Docs: add Further Reading to valid-typeof rule

This commit adds a Further Reading section to the valid-typeof rule documentation.
eslint · Jun 4, 2019 · c67c5cc · c67c5cc
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commit c67c5cc
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diff --git a/docs/rules/valid-typeof.md b/docs/rules/valid-typeof.md
@@ -57,3 +57,7 @@ typeof bar === typeof qux
 ## When Not To Use It
 
 You may want to turn this rule off if you will be using the `typeof` operator on host objects.
+
+## Further Reading
+
+* [MDN: `typeof` documentation](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/typeof)