fix review

Author: goofylfg

compiler/rustc_borrowck/src/region_infer/opaque_types.rs

@@ -40,7 +40,7 @@ impl<'tcx> RegionInferenceContext<'tcx> {
     /// compares lifetimes directly, so we need to map the inference variables
     /// back to concrete lifetimes: `'static`, `ReEarlyParam` or `ReLateParam`.
     ///
-    /// First we map the regions in the the generic parameters `_Return<'1>` to
+    /// First we map the regions in the generic parameters `_Return<'1>` to
     /// their `external_name` giving `_Return<'a>`. This step is a bit involved.
     /// See the [rustc-dev-guide chapter] for more info.
     ///

src/tools/clippy/clippy_lints/src/methods/needless_collect.rs

@@ -127,7 +127,7 @@ pub(super) fn check<'tcx>(
     }
 }
 
-/// checks for collecting into a (generic) method or function argument
+/// checks for for collecting into a (generic) method or function argument
 /// taking an `IntoIterator`
 fn check_collect_into_intoiterator<'tcx>(
     cx: &LateContext<'tcx>,