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/command/open_session.hpp b/command/open_session.hpp
index 717b99b..677fe55 100644
--- a/command/open_session.hpp
+++ b/command/open_session.hpp
@@ -7,8 +7,8 @@
 namespace command
 {
 
-/*
- * @ struct OpenSessionRequest
+/**
+ * @struct OpenSessionRequest
  *
  * IPMI Payload for RMCP+ Open Session Request
  */
@@ -82,8 +82,8 @@
     uint16_t reserved14;
 } __attribute__((packed));
 
-/*
- * @ struct OpenSessionResponse
+/**
+ * @struct OpenSessionResponse
  *
  * IPMI Payload for RMCP+ Open Session Response
  */
@@ -159,7 +159,7 @@
     uint16_t reserved14;
 } __attribute__((packed));
 
-/*
+/**
  * @brief RMCP+ Open Session Request, RMCP+ Open Session Response
  *
  * The RMCP+ Open Session request and response messages are used to enable a