Update _index.md

Quotes break link: ``` <p><img src="%22https://storage.googleapis.com/kpt-functions/docs/run.gif%22" alt="Functions Demo"></p> ```
kptdev · Jul 16, 2020 · 8ded690 · 8ded690
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diff --git a/site/content/en/concepts/functions/_index.md b/site/content/en/concepts/functions/_index.md
@@ -18,7 +18,7 @@ Use cases:
 - **Configuration Transformation:** e.g. Update all `PodSecurityPolicy` configurations to improve the
   security posture.
 
-![Functions Demo]("https://storage.googleapis.com/kpt-functions/docs/run.gif")
+![Functions Demo](https://storage.googleapis.com/kpt-functions/docs/run.gif)
 
 Config functions can be run locally or as part of a CI/CD pipeline.