📖 update the docs over regards book-v3 branch

Author: camilamacedo86

CONTRIBUTING.md

@@ -95,8 +95,8 @@ separately.
 
 The docs are published off of three branches:
 
-- `book-v2`: [book.kubebuilder.io](https://book.kubebuilder.io) -- current
-  docs
+- `book-v3`: [book.kubebuilder.io](https://book.kubebuilder.io) -- current docs
+- `book-v2`: [book-v2.kubebuilder.io](https://book.kubebuilder.io) -- legacy docs
 - `book-v1`:
   [book-v1.book.kubebuilder.io](https://book-v1.book.kubebuilder.io) --
   legacy docs

RELEASE.md

@@ -5,7 +5,7 @@ The Kubebuilder Project is released on an as-needed basis. The process is as fol
 1. An issue is proposing a new release with a changelog since the last release. You will need to use the [kubebuilder-release-tools][kubebuilder-release-tools] to generate the notes. See [here][release-notes-generation]
 1. All [OWNERS](OWNERS) must LGTM this release
 1. An OWNER runs `git tag -s $VERSION` and pushes the tag with `git push $VERSION`. Note that after the OWNER push the tag the CI will automatically add the release notes and the assets.
-1. A PR needs to be created to merge `release-X` branch into `book-vX` to pick up the new docs.
+1. A PR needs to be created to merge `master` branch into `book-v3` to pick up the new docs. 
 1. The release issue is closed
 1. An announcement email is sent to `[email protected]` with the subject `[ANNOUNCE] kubebuilder $VERSION is released`
 

VERSIONING.md

@@ -34,7 +34,7 @@ the latest controller-tools release.  That info is stored in
 ## Book Releases
 
 The book's main version (https://book.kubebuilder.io) is published off of
-the [book-v2][book-branch] (a version built off the main branch can be
+the [book-v3][book-branch] (a version built off the main branch can be
 found at https://master.book.kubebuilder.io).
 
 Docs changes that aren't specific to a new feature should be
@@ -43,7 +43,7 @@ The cherry-picks will automatically be published to the book once their PR
 merges.
 
 **When you publish a KubeBuilder release**, be sure to also submit a PR
-that merges the main branch into [book-v2][book-branch], so that it
+that merges the main branch into [book-v3][book-branch], so that it
 describes the latest changes in the new release.
 
 [book-branch]: https://github.com/kubernetes-sigs/kubebuilder/tree/tools-releases