docs: make it work with older versions of doxygen

Author: rsomla1

doc/doxygen.cfg

@@ -370,7 +370,7 @@ DISTRIBUTE_GROUP_DOC   = NO
 # is disabled and one has to add nested compounds explicitly via \ingroup.
 # The default value is: NO.
 
-GROUP_NESTED_COMPOUNDS = NO
+#GROUP_NESTED_COMPOUNDS = NO
 
 # Set the SUBGROUPING tag to YES to allow class member groups of the same type
 # (for instance a group of public functions) to be put as a subgroup of that
@@ -1025,15 +1025,15 @@ VERBATIM_HEADERS       = YES
 # compiled with the --with-libclang option.
 # The default value is: NO.
 
-CLANG_ASSISTED_PARSING = NO
+#CLANG_ASSISTED_PARSING = NO
 
 # If clang assisted parsing is enabled you can provide the compiler with command
 # line options that you would normally use when invoking the compiler. Note that
 # the include paths will already be set by doxygen for the files and directories
 # specified with INPUT and INCLUDE_PATH.
 # This tag requires that the tag CLANG_ASSISTED_PARSING is set to YES.
 
-CLANG_OPTIONS          =
+#CLANG_OPTIONS          =
 
 #---------------------------------------------------------------------------
 # Configuration options related to the alphabetical class index

doc/doxygen.cfg.in

@@ -370,7 +370,7 @@ DISTRIBUTE_GROUP_DOC   = NO
 # is disabled and one has to add nested compounds explicitly via \ingroup.
 # The default value is: NO.
 
-GROUP_NESTED_COMPOUNDS = NO
+#GROUP_NESTED_COMPOUNDS = NO
 
 # Set the SUBGROUPING tag to YES to allow class member groups of the same type
 # (for instance a group of public functions) to be put as a subgroup of that
@@ -1025,15 +1025,15 @@ VERBATIM_HEADERS       = YES
 # compiled with the --with-libclang option.
 # The default value is: NO.
 
-CLANG_ASSISTED_PARSING = NO
+#CLANG_ASSISTED_PARSING = NO
 
 # If clang assisted parsing is enabled you can provide the compiler with command
 # line options that you would normally use when invoking the compiler. Note that
 # the include paths will already be set by doxygen for the files and directories
 # specified with INPUT and INCLUDE_PATH.
 # This tag requires that the tag CLANG_ASSISTED_PARSING is set to YES.
 
-CLANG_OPTIONS          =
+#CLANG_OPTIONS          =
 
 #---------------------------------------------------------------------------
 # Configuration options related to the alphabetical class index

include/mysql_xapi.h

@@ -29,33 +29,24 @@
 
   @{
   @defgroup xapi_sess     Session operations
-  @ingroup xapi
 
   @defgroup xapi_coll     Statements operating on document collections
-  @ingroup xapi
 
   @defgroup xapi_tbl      Statements operating on tables
-  @ingroup xapi
 
   @defgroup xapi_sql      SQL execution
-  @ingroup xapi
 
   @defgroup xapi_ddl      DDL statements
-  @ingroup xapi
 
   @note To create a table or a view, use reqular SQL statement.
 
   @defgroup xapi_stmt     Statement execution
-  @ingroup xapi
 
   @defgroup xapi_res      Result processing
-  @ingroup xapi
 
   @defgroup xapi_md  Meta data access
-  @ingroup xapi_res
 
   @defgroup xapi_diag     Diganostics
-  @ingroup xapi
   @}
 */