[lldb][Docs] Use RST link format in IntelPT doc

Author: DavidSpickett

lldb/docs/use/intel_pt.rst

@@ -27,7 +27,7 @@ Build Instructions
 ------------------
 
 Clone and build the low level Intel PT
-decoder library [LibIPT library](https://github.com/intel/libipt).
+decoder library `LibIPT library <https://github.com/intel/libipt>`_.
 ::
 
   $ git clone [email protected]:intel/libipt.git