Add supported OS

content/desktop/installing-and-configuring-github-desktop/installing-and-authenticating-to-github-desktop/installing-github-desktop.md

@@ -10,7 +10,7 @@ versions:
 ---
 ### About {% data variables.product.prodname_desktop %} installation
 
-You can install {% data variables.product.prodname_desktop %} on supported operating systems. If you have an account on {% data variables.product.prodname_dotcom %} or {% data variables.product.prodname_enterprise %}, you can connect your account to {% data variables.product.prodname_desktop %}. For more information about creating an account, see "[Signing up for a new {% data variables.product.prodname_dotcom %} account](/articles/signing-up-for-a-new-github-account/)" or contact your {% data variables.product.prodname_enterprise %} site administrator.
+You can install {% data variables.product.prodname_desktop %} on supported operating systems, which currently include {% data variables.desktop.mac-osx-versions %} and {% data variables.desktop.windows-versions %}. If you have an account on {% data variables.product.prodname_dotcom %} or {% data variables.product.prodname_enterprise %}, you can connect your account to {% data variables.product.prodname_desktop %}. For more information about creating an account, see "[Signing up for a new {% data variables.product.prodname_dotcom %} account](/articles/signing-up-for-a-new-github-account/)" or contact your {% data variables.product.prodname_enterprise %} site administrator.
 
 {% windows %}