Main Readme: Cross Reference Updation

* Downloading Tools and Source Code cross reference link is updated.

Signed-off-by: Arul Kumaran <arulkumaran.devarajan@huawei.com>

README.rst

@@ -19,11 +19,11 @@ For the latest OpenHarmony Documentation, `Click <https://openharmony.readthedoc
 
 Get Source Code and Tools
 *************************
-The first thing to do is to get the required tools and source code for the development and contribution purpose. Here are the links to download the tools and source code. Once you finish downloading, you can refer to the Contribution Guidelines for more details on the process and style guides used.
+The first thing to do is to get the required tools and source code for the development and contribution purpose. Here are the links to download the tools and source code. Once you finish downloading, you can refer to the Contribution Guidelines for more details on the contribution process.
 
-* `Downloading Tools <https://openharmony.readthedocs.io/en/latest/quick-start/build-open-harmony.html#downloading-tools>`_
+* `Downloading Tools <https://openharmony.readthedocs.io/en/latest/quick-start/downloading-tools-and-sourcecode.html#downloading-tools>`_
 
-* `Downloading Source Code <https://openharmony.readthedocs.io/en/latest/quick-start/build-open-harmony.html#downloading-source-code>`_
+* `Downloading Source Code <https://openharmony.readthedocs.io/en/latest/quick-start/downloading-tools-and-sourcecode.html#downloading-source-code>`_
 
 Contribution Guidelines
 ***********************