[ZENDNN FWK] update build from source file

Minor update in BUILD_SOURCE.md

Signed-off-by: Ratan Prasad <ratan.prasad2@amd.com>
Change-Id: I44d3bd9cf20c510ee8068e3cc11e441a36a07b8b
Reviewed-on: https://gerrit-git.amd.com/c/amd/ec/ZenDNN_ONNXRuntime/+/932418
Reviewed-by: Pratap Gadi <Pratap.Gadi@amd.com>
Reviewed-by: Ratan Prasad <Ratan.Prasad2@amd.com>
Tested-by: Pratap Gadi <Pratap.Gadi@amd.com>
Tested-by: Ratan Prasad <Ratan.Prasad2@amd.com>

BUILD_SOURCE.md

@@ -24,9 +24,9 @@ $ git clone https://github.com/amd/ZenDNN-onnxruntime.git
 $ cd ZenDNN-onnxruntime
 ```
 
-The repo defaults to the main development branch which doesn't have ZenDNN support. You need to check out a release branch to build, e.g. `release/rel-1.15.1_zendnn_rel`.
+The repo defaults to the main development branch which doesn't have ZenDNN support. You need to check out a release branch to build, e.g. `rel-1.15.1_zendnn_rel`.
 ```
-$ git checkout branch_name  # release/rel-1.15.1_zendnn_rel.
+$ git checkout branch_name  # rel-1.15.1_zendnn_rel.
 ```
 
 ### Set environment variables