Updated writingmodules.rst - replaced fetch_data by the new func (#2071)

Author: vojone

docs/writingmodules.rst

@@ -659,7 +659,7 @@ checks in your code nevertheless). In those cases you can use the
         block = first_memory_block(context);
         if (block != NULL)
         {
-          block_data = block->fetch_data(block)
+          block_data = yr_fetch_block_data(block)
 
           if (block_data != NULL)
           {
@@ -668,23 +668,23 @@ checks in your code nevertheless). In those cases you can use the
         }
     }
 
-In the previous example you can also see how to use the ``fetch_data`` function.
-This function, which is a member of the ``YR_MEMORY_BLOCK`` structure, receives
-a pointer to the same block (as a ``self`` or ``this`` pointer) and returns a
-pointer to the block's data. Your module doesn't own the memory pointed to by
-this pointer, freeing that memory is not your responsibility. However keep in
-mind that the pointer is valid only until you ask for the next memory block. As
-long as you use the pointer within the scope of a ``foreach_memory_block`` you
-are on the safe side. Also take into account that ``fetch_data`` can return a
-NULL pointer, your code must be prepared for that case.
+In the previous example you can also see how to use the ``yr_fetch_block_data``
+function. This function receives a pointer to the same block (as a ``self`` or
+``this`` pointer) and returns a pointer to the block's data. Your module
+doesn't own the memory pointed to by this pointer, freeing that memory is not
+your responsibility. However keep in mind that the pointer is valid only until
+you ask for the next memory block. As long as you use the pointer within the
+scope of a ``foreach_memory_block`` you are on the safe side. Also take into
+account that ``yr_fetch_block_data`` can return a NULL pointer, your code must
+be prepared for that case.
 
 .. code-block:: c
 
     const uint8_t* block_data;
 
     foreach_memory_block(context, block)
     {
-      block_data = block->fetch_data(block);
+      block_data = yr_fetch_block_data(block);
 
       if (block_data != NULL)
       {