Fix some missed double spaces.

compiler/rustc_borrowck/src/region_infer/opaque_types.rs

@@ -235,7 +235,7 @@ impl<'tcx> InferCtxtExt<'tcx> for InferCtxt<'tcx> {
     /// # Parameters
     ///
     /// - `def_id`, the `impl Trait` type
-    /// - `substs`, the substs  used to instantiate this opaque type
+    /// - `substs`, the substs used to instantiate this opaque type
     /// - `instantiated_ty`, the inferred type C1 -- fully resolved, lifted version of
     ///   `opaque_defn.concrete_ty`
     #[instrument(level = "debug", skip(self))]

compiler/rustc_middle/src/ty/typeck_results.rs

@@ -193,7 +193,7 @@ pub struct TypeckResults<'tcx> {
     pub generator_interior_types: ty::Binder<'tcx, Vec<GeneratorInteriorTypeCause<'tcx>>>,
 
     /// We sometimes treat byte string literals (which are of type `&[u8; N]`)
-    /// as `&[u8]`, depending on the pattern  in which they are used.
+    /// as `&[u8]`, depending on the pattern in which they are used.
     /// This hashset records all instances where we behave
     /// like this to allow `const_to_pat` to reliably handle this situation.
     pub treat_byte_string_as_slice: ItemLocalSet,

compiler/rustc_parse/src/parser/pat.rs

@@ -469,7 +469,7 @@ impl<'a> Parser<'a> {
     /// Try to recover the more general form `intersect ::= $pat_lhs @ $pat_rhs`.
     ///
     /// Allowed binding patterns generated by `binding ::= ref? mut? $ident @ $pat_rhs`
-    /// should already have been parsed by now  at this point,
+    /// should already have been parsed by now at this point,
     /// if the next token is `@` then we can try to parse the more general form.
     ///
     /// Consult `parse_pat_ident` for the `binding` grammar.

compiler/rustc_target/src/asm/mod.rs

@@ -462,7 +462,7 @@ impl InlineAsmRegClass {
     }
 
     /// Returns a suggested template modifier to use for this type and an
-    /// example of a  register named formatted with it.
+    /// example of a register named formatted with it.
     ///
     /// Such suggestions are useful if a type smaller than the full register
     /// size is used and a modifier can be used to point to the subregister of