docs: Fix Eina Core Group

Summary: I had fixed unlinked Eina API group(eina_main, eina_types, hamster) from Eina nodes. Those APIs included into Core group before.

Test Plan: API reference documentation modification only

Reviewers: segfaultxavi

Reviewed By: segfaultxavi

Subscribers: cedric, #reviewers, #committers

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D11605

src/lib/eina/Eina.h

@@ -137,6 +137,10 @@
  * More examples can be found at @ref eina_examples.
  *
  *
+ * @defgroup Eina_Core_Group Core
+ * @brief Initialization and shut down and types Etc.
+ * @ingroup Eina
+ *
  * @defgroup Eina_Data_Types_Group Data Types
  * @brief Eina provides an easy to use and optimized data types and structures.
  * @ingroup Eina

src/lib/eina/eina_hamster.h

@@ -19,6 +19,12 @@
 #ifndef EINA_HAMSTER_H_
 #define EINA_HAMSTER_H_
 
+/**
+ * @addtogroup Eina_Core_Group Core
+ *
+ * @{
+ */
+
 /**
  * @defgroup Eina_Hamster_Group Hamster
  *
@@ -36,6 +42,10 @@
  */
 EAPI int eina_hamster_count(void);
 
+/**
+ * @}
+ */
+
 /**
  * @}
  */

src/lib/eina/eina_main.h

@@ -24,12 +24,6 @@
 #include "eina_types.h"
 #include "eina_error.h"
 
-/**
- * @addtogroup Eina_Main_Group Main
- *
- * @brief These functions provide general initialization and shut down
- * functions.
- */
 
 /**
  * @addtogroup Eina_Core_Group Core
@@ -40,6 +34,9 @@
 /**
  * @defgroup Eina_Main_Group Main
  *
+ * @brief These functions provide general initialization and shut down
+ * functions.
+ *
  * @{
  */
 

src/lib/eina/eina_types.h

@@ -28,6 +28,8 @@
 /**
  * @defgroup Eina_Types_Group Types
  *
+ * @brief Definition for eina types and core functions.
+ *
  * @{
  */