8312882: Update the CONTRIBUTING.md with pointers to lifecycle of a PR

CONTRIBUTING.md

@@ -1,5 +1,4 @@
 # Contributing to the JDK
 
-Please see [Contributing](https://openjdk.org/contribute) on the OpenJDK site for general background.
-The [Skara](https://wiki.openjdk.org/display/SKARA) section of the OpenJDK wiki has details on working with this repository.
-[Working With Pull Requests](https://openjdk.org/guide/#life-of-a-pr) in the OpenJDK Developers’ Guide is also helpful.
+Please see the [OpenJDK Developers’ Guide](https://openjdk.org/guide/),
+especially the section [Working With Pull Requests](https://openjdk.org/guide/#life-of-a-pr).

doc/building.md

@@ -2032,20 +2032,7 @@ First of all: Thank you! We gladly welcome your contribution.
 However, please bear in mind that the JDK is a massive project, and we must ask
 you to follow our rules and guidelines to be able to accept your contribution.
 
-The official place to start is the ['How to contribute' page](
-http://openjdk.org/contribute/). There is also an official (but somewhat
-outdated and skimpy on details) [Developer's Guide](
-http://openjdk.org/guide/).
-
-If this seems overwhelming to you, the Adoption Group is there to help you! A
-good place to start is their ['New Contributor' page](
-https://wiki.openjdk.org/display/Adoption/New+Contributor), or start
-reading the comprehensive [Getting Started Kit](
-https://adoptopenjdk.gitbooks.io/adoptopenjdk-getting-started-kit/en/). The
-Adoption Group will also happily answer any questions you have about
-contributing. Contact them by [mail](
-http://mail.openjdk.org/mailman/listinfo/adoption-discuss) or [IRC](
-http://openjdk.org/irc/).
+The official place to start is the [OpenJDK Developers’ Guide](https://openjdk.org/guide/).
 
 ## Editing this document