Plus is used instead Add class

Section says that type should have an instance of class Plus to benefit from operator + though the correct class name for this operator is Add.

Please quote the text that is incorrect:

n the following type class declaration, Plus is the name of the class, α : Type is the only argument, and plus : α → α → α is the only method:

class Plus (α : Type) where
  plus : α → α → α

> MISTAKE GOES HERE

Start with the “classes-and-instances” section of the Functional Programming in Lean manual at the linked location and review the quoted class declaration. Replace the incorrect class name Plus with Add where the text describes the operator, then verify that the surrounding explanation and example use the corrected name consistently.