[gnome-shell] Fix a typo

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 293d1697fea16a37e2882251e277ee8bc3355f87
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Mon Jun 26 13:47:19 2017 -0500

    Fix a typo

 js/gdm/util.js |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/js/gdm/util.js b/js/gdm/util.js
index 03fd344..ad9733e 100644
--- a/js/gdm/util.js
+++ b/js/gdm/util.js
@@ -138,7 +138,7 @@ const ShellUserVerifier = new Lang.Class({
 
         // We check for smartcards right away, since an inserted smartcard
         // at startup should result in immediately initiating authentication.
-        // This is different than fingeprint readers, where we only check them
+        // This is different than fingerprint readers, where we only check them
         // after a user has been picked.
         this._checkForSmartcard();