Contribution-Process.rst: Remove references to BuildOpenharmony

That reference is from old docs. The meta-ohos ones don't provide this
reference as of now.

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>
Signed-off-by: shettygururaj <gururaj.shetty@huawei.com>

readme/Contribution-Process.rst

@@ -59,13 +59,9 @@ Each commit message in Pull request must be signed-off with a proper format as f
 
 Prerequisites
 *************
-
-* To configure, install and setup your development environment of |main_project_name|, see :ref:`Getting Started <BuildOpenharmony>`.
 * Create a GitLab account on https://gitlab.com/users/sign_up and have Git tools available on your development system.
 * Find the repository that you are interested in on the code hosting platform of |main_project_name|.
 
-For downloading tools, downloading source code, and building and running |main_project_name| image, see :ref:`Getting Started <BuildOpenharmony>`.
-
 Contribution Workflow
 *********************