docs: convert plugins doc md->rst

Type: improvement

Change-Id: I7e821cce1feae229e1be4baeed249b9cca658135
Signed-off-by: Nathan Skrzypczak <nathan.skrzypczak@gmail.com>

src/plugins/bufmon/bufmon_doc.md

@@ -1,24 +0,0 @@
-# Buffers monitoring plugin {#bufmon_doc}
-
-This plugin enables to track buffer utilization in the VPP graph nodes. The
-main use is to detect buffer leakage.
-It works by keeping track of number of buffer allocations and free in graph
-nodes and also of number of buffers received in input frames and in output
-frames.
-The formula to compute the number of "buffered" buffers in a node is simply:
-        #buffered = #alloc + #input - #free - #output
-Note: monitoring will impact performances.
-
-## Basic usage
-1. Turn buffer traces on:
-```
-~# vppctl set buffer traces on
-```
-2. Monitor buffer usage:
-```
-~# vppctl show buffer traces verbose
-```
-3. Turn buffer traces off:
-```
-~# vppctl set buffer traces off
-```

src/plugins/bufmon/bufmon_doc.rst

@@ -0,0 +1,33 @@
+.. _bufmon_doc:
+
+Buffers monitoring plugin
+=========================
+
+This plugin enables to track buffer utilization in the VPP graph nodes.
+The main use is to detect buffer leakage. It works by keeping track of
+number of buffer allocations and free in graph nodes and also of number
+of buffers received in input frames and in output frames. The formula to
+compute the number of “buffered” buffers in a node is simply: #buffered
+= #alloc + #input - #free - #output Note: monitoring will impact
+performances.
+
+Basic usage
+-----------
+
+1. Turn buffer traces on:
+
+::
+
+   ~# vppctl set buffer traces on
+
+2. Monitor buffer usage:
+
+::
+
+   ~# vppctl show buffer traces verbose
+
+3. Turn buffer traces off:
+
+::
+
+   ~# vppctl set buffer traces off