fix few typos

compiler/rustc_trait_selection/src/traits/error_reporting/mod.rs

@@ -1954,7 +1954,7 @@ pub enum ArgKind {
     Arg(String, String),
 
     /// An argument of tuple type. For a "found" argument, the span is
-    /// the locationo in the source of the pattern. For a "expected"
+    /// the location in the source of the pattern. For a "expected"
     /// argument, it will be None. The vector is a list of (name, ty)
     /// strings for the components of the tuple.
     Tuple(Option<Span>, Vec<(String, String)>),

compiler/rustc_trait_selection/src/traits/select/mod.rs

@@ -944,7 +944,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
     /// subobligations without taking in a 'parent' depth, causing the
     /// generated subobligations to have a `recursion_depth` of `0`.
     ///
-    /// To ensure that obligation_depth never decreasees, we force all subobligations
+    /// To ensure that obligation_depth never decreases, we force all subobligations
     /// to have at least the depth of the original obligation.
     fn add_depth<T: 'cx, I: Iterator<Item = &'cx mut Obligation<'tcx, T>>>(
         &self,