docs(tabs): mention that index needs to be number

kwiateusz · wesleycho · commit b2984b04163b · 2016-05-07T07:53:22.000-06:00
Closes #5876
diff --git a/src/tabs/docs/readme.md b/src/tabs/docs/readme.md
@@ -45,7 +45,7 @@ AngularJS version of the tabs directive.
   Heading text.
 
 * `index` -
-  Tab index. Must be unique.
+  Tab index. Must be unique number.
 
 * `select()`
   <small class="badge">$</small> -
