Update comments on ParamForwarding and SuperAccessors.

Author: DarkDimius

src/dotty/tools/dotc/transform/ParamForwarding.scala

@@ -11,7 +11,7 @@ import Contexts._, Types._, Symbols._, Flags._, TypeUtils._, DenotTransformers._
  *
  *  if
  *  (1) x is forwarded in the supercall to a parameter that's also named `x`
- *  (2) the superclass parameter accessor for `x` is accessible from the current class to
+ *  (2) the superclass parameter accessor for `x` is accessible from the current class
  *  change the accessor to
  *
  *      def x: T = super.x.asInstanceOf[T]

src/dotty/tools/dotc/transform/SuperAccessors.scala

@@ -48,7 +48,7 @@ class SuperAccessors(thisTransformer: DenotTransformer) {
      *  of adding accessors. For instance, super calls from these regions
      *  always have to go through an accessor.
      *
-     *  The `invalidOwner` field, if different from NoSymbol,
+     *  The `invalidEnclClass` field, if different from NoSymbol,
      *  contains the symbol that is not a valid owner.
      */
     private var invalidEnclClass: Symbol = NoSymbol