Edit Into description

src/conversion/from_into.md

@@ -42,13 +42,8 @@ fn main() {
 
 ## `Into`
 
-The [`Into`] trait is simply the reciprocal of the `From` trait. That is, if you
-have implemented the `From` trait for your type you get the `Into`
-implementation for free.
-
-Using the `Into` trait will typically require specification of the type to
-convert into as the compiler is unable to determine this most of the time.
-However this is a small trade-off considering we get the functionality for free.
+The [`Into`] trait is derived from the `From` trait and is a syntactically
+different way to perform the same conversion.
 
 ```rust,editable
 use std::convert::From;