Sync with the stable documentation branch

docs/_docs/reference/changed-features/lazy-vals-init.md

@@ -4,8 +4,7 @@ title: Lazy Vals Initialization
 nightlyOf: https://docs.scala-lang.org/scala3/reference/changed-features/lazy-vals-init.html
 ---
 
-Scala 3 implements [Version 6](https://docs.scala-lang.org/sips/improved-lazy-val-initialization.html#version-6---no-synchronization-on-this-and-concurrent-initialization-of-fields)
-of the [SIP-20] improved lazy vals initialization proposal.
+Scala 3 implements Version 6 of the [SIP-20] improved lazy vals initialization proposal.
 
 ## Motivation
 
@@ -77,4 +76,4 @@ recursive lazy vals is undefined (initialization may result in a deadlock).
 
 * [SIP-20]
 
-[SIP-20]: https://docs.scala-lang.org/sips/improved-lazy-val-initialization.html
+[SIP-20]: https://github.com/scala/improvement-proposals/pull/19

docs/_docs/reference/metaprogramming/tasty-inspect.md

@@ -4,17 +4,33 @@ title: "TASTy Inspection"
 nightlyOf: https://docs.scala-lang.org/scala3/reference/metaprogramming/tasty-inspect.html
 ---
 
-```scala
-libraryDependencies += "org.scala-lang" %% "scala3-tasty-inspector" % scalaVersion.value
-```
-
 TASTy files contain the full typed tree of a class including source positions
 and documentation. This is ideal for tools that analyze or extract semantic
-information from the code. To avoid the hassle of working directly with the TASTy
+information from the code.
+
+To avoid the hassle of working directly with the TASTy
 file we provide the `Inspector` which loads the contents and exposes it
 through the TASTy reflect API.
 
-## Inspecting TASTy files
+We also showcase TASTyViz, a visualiser for tasty, useful for debugging and checking your understanding of TASTy
+
+## TASTyViz
+
+<!-- Keep synced with https://github.com/scala/docs.scala-lang/blob/main/scala3/guides/tasty-overview.md -->
+
+TASTyViz is a tool to inspect TASTy files visually.
+At the time of writing, it is still in the early stages of developement, therefore you can expect missing functionality and less-than-ideal user experience, but it could still prove useful when debugging.
+You can check it out [here](https://github.com/shardulc/tastyviz).
+
+## `Inspector`
+
+`Inspector` is a tool which provides API access to TASTy.
+
+You can add the depency to your sbt build like so:
+```scala
+libraryDependencies += "org.scala-lang" %% "scala3-tasty-inspector" % scalaVersion.value
+```
+
 
 To inspect the trees of a TASTy file a consumer can be defined in the following way.
 

docs/_docs/reference/new-types/union-types.md

@@ -4,7 +4,7 @@ title: "Union Types"
 nightlyOf: https://docs.scala-lang.org/scala3/reference/new-types/union-types.html
 ---
 
-A union type `A | B` has as values all values of type `A` and also all values of type `B`.
+A union type `A | B` includes all values of both types.
 
 
 ```scala