Update expected output of rustc --version

The format of `rustc --version` was changed in #21957.
rust-lang · Feb 27, 2015 · 9a4387f · 9a4387f
1 parent bd27985
commit 9a4387f
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/src/doc/trpl/installing-rust.md b/src/doc/trpl/installing-rust.md
@@ -70,10 +70,10 @@ If you've got Rust installed, you can open up a shell, and type this:
 $ rustc --version
 ```
 
-You should see some output that looks something like this:
+You should see the version number, commit hash, commit date and build date:
 
 ```bash
-rustc 1.0.0-nightly (f11f3e7ba 2015-01-04 20:02:14 +0000)
+rustc 1.0.0-nightly (f11f3e7ba 2015-01-04) (built 2015-01-06)
 ```
 
 If you did, Rust has been installed successfully! Congrats!