Apply suggestions from code review

Co-authored-by: Fengyun Liu <liu@fengy.me>

Author: odersky

compiler/src/dotty/tools/dotc/typer/Typer.scala

@@ -1665,7 +1665,7 @@ class Typer extends Namer
       checkRefinementNonCyclic(refinement, refineCls, seen)
       val rsym = refinement.symbol
       rsym.setTargetName(EmptyTermName)
-        // refinements can refine members with arbitrary target names, so we make their tragetnames
+        // refinements can refine members with arbitrary target names, so we make their target names
         // polymorphic here in order to avoid to trigger the `member.isOverloaded` test below.
       val polymorphicRefinementAllowed =
         tpt1.tpe.typeSymbol == defn.PolyFunctionClass && rsym.name == nme.apply

docs/docs/reference/other-new-features/targetName.md

@@ -3,7 +3,7 @@ layout: doc-page
 title: The @targetName annotation
 ---
 
-A `@targetName` annotation on a definition defines an alternate name for the implementation of that definition: Example:
+A `@targetName` annotation on a definition defines an alternate name for the implementation of that definition. Example:
 ```scala
 import scala.annotation.targetName