Rollup merge of rust-lang#25376 - swaroopch:patch-2, r=steveklabnik

I don't recall reading about this `Debug` trait so far in the book. Please ignore this PR if I have missed that part.

r? @steveklabnik

Author: steveklabnik

src/doc/trpl/error-handling.md

@@ -181,6 +181,8 @@ match version {
 This function makes use of an enum, `ParseError`, to enumerate the various
 errors that can occur.
 
+The [`Debug`](../std/fmt/trait.Debug.html) trait is what lets us print the enum value using the `{:?}` format operation.
+
 # Non-recoverable errors with `panic!`
 
 In the case of an error that is unexpected and not recoverable, the `panic!`