Remove double spaces after dots in comments

compiler/rustc_mir_transform/src/sroa.rs

@@ -215,7 +215,7 @@ struct ReplacementVisitor<'tcx, 'll> {
     replacements: ReplacementMap<'tcx>,
     /// This is used to check that we are not leaving references to replaced locals behind.
     all_dead_locals: BitSet<Local>,
-    /// Pre-computed list of all "new" locals for each "old" local.  This is used to expand storage
+    /// Pre-computed list of all "new" locals for each "old" local. This is used to expand storage
     /// and deinit statement and debuginfo.
     fragments: IndexVec<Local, Vec<(&'tcx [PlaceElem<'tcx>], Local)>>,
 }