trace doc: convert trace/intel_th.txt to rst format

This converts the plain text documentation to reStructuredText format and
add it into Sphinx TOC tree. No essential content change.

Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Changbin Du <changbin.du@intel.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/trace/index.rst

@@ -19,3 +19,4 @@ Linux Tracing Technologies
    events-msr
    mmiotrace
    hwlat_detector
+   intel_th

Documentation/trace/intel_th.txt → Documentation/trace/intel_th.rst

+=======================
 Intel(R) Trace Hub (TH)
 =======================
 
@@ -65,41 +66,41 @@ allocated, are accessible via /dev/intel_th0/msc{0,1}.
 Quick example
 -------------
 
-# figure out which GTH port is the first memory controller:
+# figure out which GTH port is the first memory controller::
 
-$ cat /sys/bus/intel_th/devices/0-msc0/port
-0
+	$ cat /sys/bus/intel_th/devices/0-msc0/port
+	0
 
-# looks like it's port 0, configure master 33 to send data to port 0:
+# looks like it's port 0, configure master 33 to send data to port 0::
 
-$ echo 0 > /sys/bus/intel_th/devices/0-gth/masters/33
+	$ echo 0 > /sys/bus/intel_th/devices/0-gth/masters/33
 
 # allocate a 2-windowed multiblock buffer on the first memory
-# controller, each with 64 pages:
+# controller, each with 64 pages::
 
-$ echo multi > /sys/bus/intel_th/devices/0-msc0/mode
-$ echo 64,64 > /sys/bus/intel_th/devices/0-msc0/nr_pages
+	$ echo multi > /sys/bus/intel_th/devices/0-msc0/mode
+	$ echo 64,64 > /sys/bus/intel_th/devices/0-msc0/nr_pages
 
-# enable wrapping for this controller, too:
+# enable wrapping for this controller, too::
 
-$ echo 1 > /sys/bus/intel_th/devices/0-msc0/wrap
+	$ echo 1 > /sys/bus/intel_th/devices/0-msc0/wrap
 
-# and enable tracing into this port:
+# and enable tracing into this port::
 
-$ echo 1 > /sys/bus/intel_th/devices/0-msc0/active
+	$ echo 1 > /sys/bus/intel_th/devices/0-msc0/active
 
 # .. send data to master 33, see stm.txt for more details ..
 # .. wait for traces to pile up ..
-# .. and stop the trace:
+# .. and stop the trace::
 
-$ echo 0 > /sys/bus/intel_th/devices/0-msc0/active
+	$ echo 0 > /sys/bus/intel_th/devices/0-msc0/active
 
-# and now you can collect the trace from the device node:
+# and now you can collect the trace from the device node::
 
-$ cat /dev/intel_th0/msc0 > my_stp_trace
+	$ cat /dev/intel_th0/msc0 > my_stp_trace
 
 Host Debugger Mode
-==================
+------------------
 
 It is possible to configure the Trace Hub and control its trace
 capture from a remote debug host, which should be connected via one of