Ch. 10.1: further clarify graf about methods in impl<T> ... blocks

Author: chriskrycho

src/ch10-01-syntax.md

@@ -210,9 +210,9 @@ generic type after `impl`, Rust can identify that the type in the angle
 brackets in `Point` is a generic type rather than a concrete type. We could
 have chosen a different name for this generic parameter than the generic
 parameter declared in the struct definition, but using the same name is
-conventional. If there is a method written within an `impl` that declares the generic type,
-that method will be defined on any instance of the type, no matter what concrete type ends
-up substituting for the generic type.
+conventional. Within an `impl` that declares a generic type, each method you
+write will be defined on any instance of the type, no matter what concrete type
+ends up substituting for the generic type.
 
 We can also specify constraints on generic types when defining methods on the
 type. We could, for example, implement methods only on `Point<f32>` instances