Merge commit 'b52fb5234cd7c11ecfae51897a6f7fa52e8777fc' into clippyup

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diff --git a/src/docs/ref_binding_to_reference.txt b/src/docs/ref_binding_to_reference.txt
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+### What it does
+Checks for `ref` bindings which create a reference to a reference.
+
+### Why is this bad?
+The address-of operator at the use site is clearer about the need for a reference.
+
+### Example
+```
+let x = Some("");
+if let Some(ref x) = x {
+    // use `x` here
+}
+```
+
+Use instead:
+```
+let x = Some("");
+if let Some(x) = x {
+    // use `&x` here
+}
+```
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