minor #4488 Update coding standards (VincentLanglet)

This PR was squashed before being merged into the 3.x branch.

Discussion
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Update coding standards

Commits
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07a4ed1 Update coding standards

doc/coding_standards.rst

@@ -88,17 +88,17 @@ standards:
     [1, 2, 3]
     {'name': 'Fabien'}
 
-* Do not put any spaces before and after ``=`` in macro argument declarations:
+* Put exactly one space before and after ``=`` in macro argument declarations:
 
   .. code-block:: twig
 
-    {% macro html_input(class="input") %}
+    {% macro html_input(class = "input") %}
 
-* Put exactly one space after the ``:`` sign in macro argument declarations:
+* Put exactly one space after the ``:`` sign when using named arguments:
 
   .. code-block:: twig
 
-    {% macro html_input(class: "input") %}
+    {{ html_input(class: "input") }}
 
 * Use snake case for all variable names (provided by the application and
   created in templates), function/filter/test names, argument names and named