Supported boards readme: Topic updation for place holder

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

documentation/source/supported-boards/Readme.rst

@@ -5,7 +5,7 @@
 Supported Boards
 ################
 
-Harmony OS supports the following boards:
+|main_project_name| supports the following boards:
 
 .. toctree::
    :maxdepth: 1
@@ -14,7 +14,5 @@ Harmony OS supports the following boards:
    96b-nitrogen
    seco-intel-b68
    seco-imx8mm-c61
-      
-For more information on supported boards and instructions to use them, see https://git.ostc-eu.org/OSTC/OHOS/docs/developer-guide/-/tree/master/documentation/source/supported-boards.