minor symfony#10327 Fix link for webpack encore (BackEndTea)

This PR was merged into the 3.4 branch.

Discussion
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Fix link for webpack encore

Should fix symfony#10326

Commits
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0fca11c Fix link for webpack encore

Author: javiereguiluz

deployment.rst

@@ -186,7 +186,7 @@ setup:
 * Running any database migrations
 * Clearing your APC cache
 * Add/edit CRON jobs
-* ref:`Building and minifying your assets <how-do-i-deploy-my-encore-assets>` with Webpack Encore
+* :ref:`Building and minifying your assets <how-do-i-deploy-my-encore-assets>` with Webpack Encore
 * Pushing assets to a CDN
 * ...