Refs #21114: Remove unsued Doxyfile EXAMPLE_PATH

Signed-off-by: eduponz <eduardoponz@eprosima.com>

Author: EduPonz

code/doxygen-config.in

@@ -985,7 +985,7 @@ EXCLUDE_SYMBOLS        =
 # that contain example code fragments that are included (see the \include
 # command).
 
-EXAMPLE_PATH           = @PROJECT_SOURCE_DIR@/code
+EXAMPLE_PATH           =
 
 # If the value of the EXAMPLE_PATH tag contains directories, you can use the
 # EXAMPLE_PATTERNS tag to specify one or more wildcard pattern (like *.cpp and