Merge commit 'b52fb5234cd7c11ecfae51897a6f7fa52e8777fc' into clippyup

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diff --git a/src/docs/explicit_iter_loop.txt b/src/docs/explicit_iter_loop.txt
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+### What it does
+Checks for loops on `x.iter()` where `&x` will do, and
+suggests the latter.
+
+### Why is this bad?
+Readability.
+
+### Known problems
+False negatives. We currently only warn on some known
+types.
+
+### Example
+```
+// with `y` a `Vec` or slice:
+for x in y.iter() {
+    // ..
+}
+```
+
+Use instead:
+```
+for x in &y {
+    // ..
+}
+```
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