Names variation

Hello Everyone,

Pls can someone help me on how to go about this. I am about filing i130 for my mother, I discovered that in her first name on my birth certificate, it does have l placed where r was supposed to be and same on her marriage certificate. But her passport and ID has the right spelling. Pls can any one guide me on how to do it, so I don't get an RFE from uscis. Thank you.