minor symfony#4434 remove unused label (xabbuh)

This PR was merged into the 2.3 branch.

Discussion
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remove unused label

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | all
| Fixed tickets |

Commits
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60ad490 remove unused label

Author: wouterj

best_practices/templates.rst

@@ -22,8 +22,6 @@ In addition, Twig is the only template format with guaranteed support in Symfony
 3.0. As a matter of fact, PHP may be removed from the officially supported
 template engines.
 
-.. _best_practices-template-location:
-
 Template Locations
 ------------------