all: fix some typos

Signed-off-by: cuishuang <imcusg@gmail.com>

compiler/rustc_infer/src/infer/error_reporting/need_type_info.rs

@@ -935,7 +935,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
 /// performing that replacement, we'll turn all remaining infer type params to use their name from
 /// their definition, and replace all the `[type error]`s back to being infer so they display in
 /// the output as `_`. If we didn't go through `[type error]`, we would either show all type params
-/// by their name *or* `_`, neither of which is desireable: we want to show all types that we could
+/// by their name *or* `_`, neither of which is desirable: we want to show all types that we could
 /// infer as `_` to reduce verbosity and avoid telling the user about unnecessary type annotations.
 struct ResolvedTypeParamEraser<'tcx> {
     tcx: TyCtxt<'tcx>,

compiler/rustc_infer/src/infer/error_reporting/nice_region_error/mismatched_static_lifetime.rs

@@ -58,7 +58,7 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> {
                 bug!("Node not an impl.");
             };
 
-            // Next, let's figure out the set of trait objects with implict static bounds
+            // Next, let's figure out the set of trait objects with implicit static bounds
             let ty = self.tcx().type_of(*impl_def_id);
             let mut v = super::static_impl_trait::TraitObjectVisitor(FxHashSet::default());
             v.visit_ty(ty);