minor symfony#10370 [Encore] Make title in FAQ more clear (royklutman)

This PR was squashed before being merged into the 3.4 branch (closes symfony#10370).

Discussion
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[Encore] Make title in FAQ more clear

The current command in the bold text looks a little odd, because monospaced text can't be combined with bold text in RST:

![image](https://user-images.githubusercontent.com/14876024/45815287-75cb0f80-bcd8-11e8-933c-d67f61e82a15.png)

It makes more sense to use double quotes:

![image](https://user-images.githubusercontent.com/14876024/45815313-867b8580-bcd8-11e8-87ee-2115ae1154b7.png)

See: https://symfony.com/doc/master/frontend/encore/faq.html#how-do-i-deploy-my-encore-assets

Commits
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da34edd [Encore] Make title in FAQ more clear

frontend/encore/faq.rst

@@ -8,7 +8,7 @@ How do I deploy my Encore Assets?
 
 There are two important things to remember when deploying your assets.
 
-**1) Run ``encore production``**
+**1) Compile assets for production**
 
 Optimize your assets for production by running: