Apply suggestions from code review

Co-Authored-By: Jens <DieBauer@users.noreply.github.com>

Author: nicolasstucki

compiler/src/dotty/tools/dotc/parsing/Parsers.scala

@@ -3278,7 +3278,7 @@ object Parsers {
             leadingVparamss ::: rparamss
         var tpt = fromWithinReturnType {
           if in.token == SUBTYPE && mods.is(Inline) && AllowOldWhiteboxSyntax then
-            deprecationWarning("`<:` return type will no longer be suported. Use transparent modifier insead.")
+            deprecationWarning("`<:` return type will no longer be supported. Use transparent modifier instead.")
             in.nextToken()
             mods1 = addMod(mods1, Mod.Transparent())
             toplevelTyp()
@@ -3548,7 +3548,7 @@ object Parsers {
           mods1 |= Final
           DefDef(name, tparams, vparamss, tpt, subExpr())
         if in.token == USCORE && AllowOldWhiteboxSyntax then
-          deprecationWarning("`<:` return type will no longer be suported. Use transparent modifier insead.")
+          deprecationWarning("`<:` return type will no longer be supported. Use transparent modifier instead.")
           if !mods.is(Inline) then
             syntaxError("`_ <:` is only allowed for given with `inline` modifier")
           in.nextToken()