Added link to JSFiddle example
feature #4125 Added link to JSFiddle example (WouterJ)

This PR was merged into the 2.3 branch.

Discussion
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Added link to JSFiddle example

| Q   | A
| --- | ---
| Doc fix? | yes
| New docs? | no
| Applies to | all
| Fixed tickets | https://github.com/symfony/symfony-docs/pull/3853

Commits
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fe53a3f Added link to JSFiddle example