Note dropped annotations in propertyNames

Signed-off-by: Juan Cruz Viotti <[email protected]>

Author: jviotti

content/2020-12/applicator/propertyNames.markdown

@@ -37,7 +37,8 @@ properties whose names match the given schema. This keyword is evaluated
 against _every_ property of the object instance, independently of keywords that
 indirectly introduce property names such as [`properties`]({{< ref
 "2020-12/applicator/properties" >}}) and [`patternProperties`]({{< ref
-"2020-12/applicator/patternproperties" >}}).
+"2020-12/applicator/patternproperties" >}}). Annotations coming from inside
+this keyword are dropped.
 
 {{<common-pitfall>}} As per the JSON grammar, the name of an object property
 must be a string. Therefore, setting this keyword to a schema that makes use of