Correct doxygen syntax in phosphor-net-ipmid

Resolves openbmc/openbmc#1147

Change-Id: I57ab1b09ec1bf308cc3d97cd30b2d18564beb38b
Signed-off-by: Tom Joseph <tomjoseph@in.ibm.com>
diff --git a/provider_registration.hpp b/provider_registration.hpp
index 6c05dde..ad956fc 100644
--- a/provider_registration.hpp
+++ b/provider_registration.hpp
@@ -3,7 +3,7 @@
 namespace provider
 {
 
-/*
+/**
  * @brief Provider Library filename extension
  *
  * Autotools versions the shared libraries, so the shared libraries end with
@@ -12,7 +12,7 @@
 
 constexpr auto PROVIDER_SONAME_EXTN = ".so.";
 
-/*
+/**
  * @brief Register Callback handlers for IPMI provider libraries
  *
  * Open the directory path for net-ipmid provider libraries and scan the