improvement to an article in learn

I am very pleased to see an article in one of the learn pages?  

This one

https://wiki.dfrobot.com/dfplayer_mini_sku_dfr0299

But can I point out an error?

It shows a connection to a speaker from pins 6 and 8 giving a mono output, if the speaker is connected to pins 6 and 7(gnd) and another speaker to pins 8 and 7 the output would be in stereo. 

I hope this can be corrected to improve what is already a good article.