typo

Author: ablaom

docs/src/anatomy_of_an_implementation.md

@@ -198,7 +198,7 @@ predictions.
 ## Algorithm traits
 
 Algorithm [traits](@ref traits) record extra generic information about an algorithm, or
-make specific promises of behavior. They are methods that have an algorithm as the solve
+make specific promises of behavior. They are methods that have an algorithm as the sole
 argument, and so we regard [`LearnAPI.constructor`](@ref) defined above as a trait.
 
 Because we have implemented `predict`, we are required to overload the