docs(GITBOOK#136): Fix broken link for RDP, SFTP etc.

docs/usage/basic-usage-1/README.md

@@ -70,7 +70,7 @@ sshnp ... -h @rv_ap ...
 
 ## SSH Authentication
 
-In addition to the four main parameters, it is important to ensure that the appropriate SSH authentication keys are in place. 
+In addition to the four main parameters, it is important to ensure that the appropriate SSH authentication keys are in place.
 
 #### Pre-existing keys in place
 
@@ -127,6 +127,5 @@ The rest of the configuration for `sshnp` is contained in a separate guide:
 
 ## Want to use RDP, SFTP or etc?
 
-{% content-ref url="broken-reference" %}
-[Broken link](broken-reference)
-{% endcontent-ref %}
+The NoPorts Tunnel (NPT) can carry a wide variety of TCP based protocols such as [SFTP](../../use-cases/sftp.md), [RDP](../../use-cases/rdp.md), [SMB](../../use-cases/smb.md) and [HTTP(S)](../../use-cases/web-server.md).
+