Fix typo in the property filters docs

dunglas · web-flow · commit c1bad377192d · 2018-02-01T17:36:55.000+01:00
diff --git a/core/filters.md b/core/filters.md
@@ -479,7 +479,7 @@ services:
 
 ### Property filter
 
-The property filter add the possibility to filter serialization properties.
+The property filter adds the possibility to filter serialization properties.
 
 Syntax: `?properties[]=<property>`
 
