Merge pull request #7165 from dotty-staging/add-dotty-staging.g8

Add dotty-staging.g8 in the staging documentation

Author: biboudis

docs/docs/reference/metaprogramming/staging.md

@@ -71,6 +71,16 @@ def run[T](expr: given QuoteContext => Expr[T]) given (toolbox: Toolbox): T = ..
 def withQuoteContext[T](thunk: given QuoteContext => T) given (toolbox: Toolbox): T = ...
 ```
 
+## Create a new Dotty project with staging enabled
+
+```shell
+sbt new lampepfl/dotty-staging.g8
+```
+
+From [lampepfl/dotty-staging.g8](https://github.com/lampepfl/dotty-staging.g8).
+
+It will create a project with the necessary dependencies and some examples.
+
 ## Example
 
 Now take exactly the same example as in [Macros](./macros.md). Assume that we
@@ -84,7 +94,7 @@ to get a source-like representation of the expression.
 import scala.quoted.staging._
 
 // make available the necessary toolbox for runtime code generation
-delegate for Toolbox = Toolbox.make(getClass.getClassLoader)
+given as Toolbox = Toolbox.make(getClass.getClassLoader)
 
 val f: Array[Int] => Int = run {
   val stagedSum: Expr[Array[Int] => Int] = '{ (arr: Array[Int]) => ${sum('arr)}}
@@ -99,11 +109,12 @@ Note that if we need to run the main (in an object called `Test`) after
 compilation we need make available the compiler to the runtime:
 
 ```shell
-sbt:dotty> dotr -classpath out -with-compiler Test
+dotc -with-compiler -d out Test.scala
+dotr -with-compiler -classpath out Test
 ```
 
 Or, from SBT:
 
 ```scala
-libraryDependencies += "ch.epfl.lamp" %% "dotty-compiler" % scalaVersion.value
+libraryDependencies += "ch.epfl.lamp" %% "dotty-staging" % scalaVersion.value
 ```