Update client-side-templates.md

Author: cure53

docs/client-side-templates.md

@@ -11,7 +11,7 @@ Many client-side templates look for special constructs in text nodes. Often, us
 | Template Language | Construct | Example | Notes |
 | ----------------- | --------- | ------- | ----- |
 | Angular | `{{`...`}}` | [`{{buttonText}}`](https://docs.angularjs.org/guide/templates) | 
-| Polymer | `{{`...`}}` | `{{arrayOfFriends | startsWith('M')}}`](expressions) |
+| Polymer | `{{`...`}}` | [`{{arrayOfFriends | startsWith('M')}}`](https://www.polymer-project.org/0.5/docs/polymer/expressions.html) |
 | CanJS | `<%`...`%>` | `<% alert(0) %>` | |
 | Underscore | `<%`...`%>` | `<% alert(0) %>` | |
 | Ember | `{{`...`}}` | `{{#view tagName=script}}alert(2){{/view}}` | |