Add docs for coupon credits

[aayushmahapatra]

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[rekpero]

bro don't you read the content you are copying and also are you not trying it yourself, why is the whole context messed up? You should try the feature before you should write the steps around it, a lot of improvement has been done from last time the steps are now not the same, you should check properly what we should write instead of copying it blindly