Update migration guide (#2901)

* Update migration guide

- Updated to latest versions of Scala (3.3.0, 2.13.11)
- sbt-scala3-migrate tuto moved to tutorials chapter
- sbt-scala3-migrate tuto updated to 0.6.0 version

* Bump to 3.3.1

* Bump sbt-scala3-migrate to 0.6.1

* fix CI

_overviews/scala3-migration/compatibility-classpath.md

@@ -24,23 +24,24 @@ The Scala 3 unpickler has been extensively tested in the community build for man
 
 ![Scala 3 module depending on a Scala 2.13 artifact](/resources/images/scala3-migration/compatibility-3-to-213.svg)
 
-As an sbt build it can be illustrated by (sbt 1.5.0 or higher is required):
+As an sbt build, it looks like this:
 
 ```scala
+// build.sbt (sbt 1.5 or higher)
 lazy val foo = project.in(file("foo"))
-  .settings(scalaVersion := "3.0.0")
+  .settings(scalaVersion := "3.3.1")
   .dependsOn(bar)
 
 lazy val bar = project.in(file("bar"))
-  .settings(scalaVersion := "2.13.6")
+  .settings(scalaVersion := "2.13.11")
 ```
 
 Or, in case bar is a published Scala 2.13 library, we can have:
 
 ```scala
 lazy val foo = project.in(file("foo"))
   .settings(
-    scalaVersion := "3.0.0",
+    scalaVersion := "3.3.1",
     libraryDependencies += ("org.bar" %% "bar" % "1.0.0").cross(CrossVersion.for3Use2_13)
   )
 ```
@@ -56,13 +57,11 @@ Let's note that the standard library is automatically provided by the build tool
 
 ## The Scala 2.13 TASTy Reader
 
-The second piece of good news is that the Scala 2.13 TASTy reader, which enables consuming Scala 3 libraries has been shipped since Scala 2.13.4.
-
-> The TASTy reader is very new. That's why it is  only available under the `-Ytasty-reader` flag.
+The second piece of good news is that Scala 2.13 can consume Scala 3 libraries with `-Ytasty-reader`.
 
 ### Supported Features
 
-The TASTy reader supports all the traditional language features as well as the following brand-new features:
+The TASTy reader supports all the traditional language features as well as the following Scala 3 features:
 - [Enumerations]({{ site.scala3ref }}/enums/enums.html)
 - [Intersection Types]({{ site.scala3ref }}/new-types/intersection-types.html)
 - [Opaque Type Aliases]({{ site.scala3ref }}/other-new-features/opaques.html)
@@ -71,11 +70,11 @@ The TASTy reader supports all the traditional language features as well as the f
 - [Open Classes]({{ site.scala3ref }}/other-new-features/open-classes.html) (and inheritance of super traits)
 - [Export Clauses]({{ site.scala3ref }}/other-new-features/export.html)
 
-We have limited support on:
+It partially supports:
 - [Top-Level Definitions]({{ site.scala3ref }}/dropped-features/package-objects.html)
 - [Extension Methods]({{ site.scala3ref }}/contextual/extension-methods.html)
 
-More exotic features are not supported:
+It does not support the more advanced features:
 - [Context Functions]({{ site.scala3ref }}/contextual/context-functions.html)
 - [Polymorphic Function Types]({{ site.scala3ref }}/new-types/polymorphic-function-types.html)
 - [Trait Parameters]({{ site.scala3ref }}/other-new-features/trait-parameters.html)
@@ -94,26 +93,27 @@ By enabling the TASTy reader with `-Ytasty-reader`, a Scala 2.13 module can depe
 
 ![Scala 2 module depending on a Scala 3 artifact](/resources/images/scala3-migration/compatibility-213-to-3.svg)
 
-As an sbt build it can be illustrated by:
+As an sbt build, it looks like this:
 
 ```scala
+// build.sbt (sbt 1.5 or higher)
 lazy val foo = project.in.file("foo")
   .settings(
-    scalaVersion := "2.13.6",
+    scalaVersion := "2.13.11",
     scalacOptions += "-Ytasty-reader"
   )
   .dependsOn(bar)
 
 lazy val bar = project.in(file("bar"))
-  .settings(scalaVersion := "3.0.0")
+  .settings(scalaVersion := "3.3.1")
 ```
 
 Or, in case `bar` is a published Scala 3 library:
 
 ```scala
 lazy val foo = project.in.file("foo")
   .settings(
-    scalaVersion := "2.13.6",
+    scalaVersion := "2.13.11",
     scalacOptions += "-Ytasty-reader",
     libraryDependencies += ("org.bar" %% "bar" % "1.0.0").cross(CrossVersion.for2_13Use3)
   )
@@ -137,7 +137,5 @@ The inverted pattern, with a 2.13 module in the middle, is also possible.
 
 > #### Disclaimer for library maintainers
 > 
-> Using the interoperability between Scala 2.13 and Scala 3 in a published library is generally not safe for your end-users.
-> 
 > Unless you know exactly what you are doing, it is discouraged to publish a Scala 3 library that depends on a Scala 2.13 library (the scala-library being excluded) or vice versa.
 > The reason is to prevent library users from ending up with two conflicting versions `foo_2.13` and `foo_3` of the same foo library in their classpath, this problem being unsolvable in some cases.

_overviews/scala3-migration/compatibility-metaprogramming.md

@@ -14,7 +14,7 @@ Therefore it is not possible for the Scala 3 compiler to expand any Scala 2.13 m
 
 In contrast, Scala 3 introduces a new principled approach of metaprogramming that is designed for stability.
 Scala 3 macros, and inline methods in general, will be compatible with future versions of the Scala 3 compiler.
-While this is an uncontested improvement, it also means that all Scala 2.13 macros have to be rewritten from the ground up, by using the new metaprogramming features.
+While this is an uncontested improvement, it also means that all Scala 2.13 macros have to be rewritten from the ground up, using the new metaprogramming features.
 
 ## Macro Dependencies
 
@@ -54,16 +54,16 @@ They are comprised of:
 
 Before getting deep into reimplementing a macro you should ask yourself:
 - Can I use `inline` and the `scala.compiletime` operations to reimplement my logic?
-- Can I use the simpler and safer expression based macros?
+- Can I use the simpler and safer expression-based macros?
 - Do I really need to access the AST?
 - Can I use a [match type]({{ site.scala3ref }}/new-types/match-types.html) as return type?
 
-You can learn all the new metaprogramming concepts by reading the [Macro Tutorial][scala3-macros].
+You can learn all the new metaprogramming concepts by reading the [Macros in Scala 3][scala3-macros] tutorial.
 
 ## Cross-building a Macro Library
 
 You have written a wonderful macro library and you would like it to be available in Scala 2.13 and Scala 3.
-There are two different approaches, the traditional cross-building technique and the more recent mixing macro technique.
+There are two different approaches, the traditional cross-building technique and the more experimental mixing macro technique.
 You can learn about them by reading these tutorials:
 - [Cross-Building a Macro Library](tutorial-macro-cross-building.html)
 - [Mixing Scala 2.13 and Scala 3 Macros](tutorial-macro-mixing.html)

_overviews/scala3-migration/external-resources.md

@@ -1,8 +1,8 @@
 ---
 title: External Resources
-type: section
+type: chapter
 description: This section lists external resources about the migration to Scala 3.
-num: 27
+num: 28
 previous-page: plugin-kind-projector
 next-page:
 ---