Updated the git clone commands for helm-charts to correctly use the cord-6.0 branch

Change-Id: I4cad74b5f27416f9acccfaad373ac4de1a6f0960
diff --git a/charts/helm.md b/charts/helm.md
index 8b1c2e3..408906e 100644
--- a/charts/helm.md
+++ b/charts/helm.md
@@ -71,7 +71,7 @@
 You can get the CORD helm charts by cloning the `helm-charts` repository:
 
 ```shell
-git clone https://gerrit.opencord.org/helm-charts
+git clone https://gerrit.opencord.org/helm-charts -b cord-6.0
 ```
 
 > **Note:** If you have downloaded the CORD code following the [Getting the Source
diff --git a/linux.md b/linux.md
index 6e22f34..1c88395 100644
--- a/linux.md
+++ b/linux.md
@@ -111,7 +111,7 @@
 ```shell
 mkdir ~/cord
 cd ~/cord
-git clone https://gerrit.opencord.org/helm-charts
+git clone https://gerrit.opencord.org/helm-charts -b cord-6.0
 cd helm-charts
 ```
 
diff --git a/macos.md b/macos.md
index 59e4b6d..9f2c5b7 100644
--- a/macos.md
+++ b/macos.md
@@ -81,7 +81,7 @@
 ```shell
 mkdir ~/cord
 cd ~/cord
-git clone https://gerrit.opencord.org/helm-charts
+git clone https://gerrit.opencord.org/helm-charts -b cord-6.0
 cd helm-charts
 ```