minor #4610 Use : instead of = for named argument in the docs (jdreesen)

This PR was merged into the 3.x branch.

Discussion
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Use `:` instead of `=` for named argument in the docs

Commits
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ccec90c Use `:` instead of `=` for named argument in the docs

Author: fabpot

Diff for: doc/functions/include.rst

@@ -48,7 +48,7 @@ the template does not exist:
 
 .. code-block:: twig
 
-    {{ include('sidebar.html.twig', ignore_missing = true) }}
+    {{ include('sidebar.html.twig', ignore_missing: true) }}
 
 You can also provide a list of templates that are checked for existence before
 inclusion. The first template that exists will be rendered: