Fix quote report code example

Also update the se of `Expr.summon`

Fixes #10308

Author: nicolasstucki

docs/docs/reference/metaprogramming/macros.md

@@ -742,12 +742,12 @@ extension (inline sc: StringContext)
    inline def showMe(inline args: Any*): String = ${ showMeExpr('sc, 'args) }
 
 private def showMeExpr(sc: Expr[StringContext], argsExpr: Expr[Seq[Any]])(using Quotes): Expr[String] =
+   import quotes.reflect.report
    argsExpr match
       case Varargs(argExprs) =>
          val argShowedExprs = argExprs.map {
             case '{ $arg: tp } =>
-               val showTp = Type.of[Show[tp]]
-               Expr.summon(using showTp) match
+               Expr.summon[Show[tp]] match
                   case Some(showExpr) =>
                      '{ $showExpr.show($arg) }
                   case None =>

tests/run-macros/string-context-implicits/Macro_1.scala

@@ -3,26 +3,24 @@ import scala.quoted._
 
 extension (sc: StringContext) inline def showMe(inline args: Any*): String = ${ showMeExpr('sc, 'args) }
 
-private def showMeExpr(sc: Expr[StringContext], argsExpr: Expr[Seq[Any]])(using Quotes): Expr[String] = {
+private def showMeExpr(sc: Expr[StringContext], argsExpr: Expr[Seq[Any]])(using Quotes): Expr[String] =
   import quotes.reflect.report
-  argsExpr match {
+  argsExpr match
     case Varargs(argExprs) =>
       val argShowedExprs = argExprs.map {
         case '{ $arg: tp } =>
-          val showTp = Type.of[Show[tp]]
-          Expr.summon(using showTp) match {
-            case Some(showExpr) => '{ $showExpr.show($arg) }
-            case None => report.error(s"could not find implicit for ${Type.show[Show[tp]]}", arg); '{???}
-          }
+          Expr.summon[Show[tp]] match
+            case Some(showExpr) =>
+              '{ $showExpr.show($arg) }
+            case None =>
+              report.error(s"could not find implicit for ${Type.show[Show[tp]]}", arg); '{???}
       }
       val newArgsExpr = Varargs(argShowedExprs)
       '{ $sc.s($newArgsExpr: _*) }
     case _ =>
       // `new StringContext(...).showMeExpr(args: _*)` not an explicit `showMeExpr"..."`
       report.error(s"Args must be explicit", argsExpr)
-      '{???}
-  }
-}
+      '{ ??? }
 
 trait Show[-T] {
   def show(x: T): String