Update api doc

doc/zh-Hans/api.doxyfile

@@ -91,7 +91,7 @@ ALLOW_UNICODE_NAMES    = NO
 # Ukrainian and Vietnamese.
 # The default value is: English.
 
-OUTPUT_LANGUAGE        = English
+OUTPUT_LANGUAGE        = Chinese
 
 # If the BRIEF_MEMBER_DESC tag is set to YES, doxygen will include brief member
 # descriptions after the members that are listed in the file and class
@@ -874,7 +874,7 @@ FILE_PATTERNS          = *.c \
 # be searched for input files as well.
 # The default value is: NO.
 
-RECURSIVE              = NO
+RECURSIVE              = YES
 
 # The EXCLUDE tag can be used to specify files and/or directories that should be
 # excluded from the INPUT source files. This way you can easily exclude a

doc/zh-Hans/mainpage.md

@@ -1,4 +1,9 @@
 # MYNT EYE SDK {#mainpage}
 
-* @subpage specs_data
-* @subpage specs_ctrl
+* API 模块
+  * \link enumerations 枚举类型\endlink
+  * \link datatypes 数据类型\endlink
+  * \link calibration 内参与外参\endlink
+* 设备说明
+  * @subpage specs_data
+  * @subpage specs_ctrl