Corrected example in docs (#1087)

* Corrected example

* Added clarification on nested filter usage

Author: Bart Koelman

docs/usage/reading/filtering.md

@@ -42,7 +42,7 @@ GET /users?filter=equals(displayName,null) HTTP/1.1
 GET /users?filter=equals(displayName,lastName) HTTP/1.1
 ```
 
-Comparison operators can be combined with the `count` function, which acts on HasMany relationships:
+Comparison operators can be combined with the `count` function, which acts on to-many relationships:
 
 ```http
 GET /blogs?filter=lessThan(count(owner.articles),'10') HTTP/1.1
@@ -60,14 +60,16 @@ GET /customers?filter=has(orders)&filter=equals(lastName,'Smith') HTTP/1.1
 ```
 
 Aside from filtering on the resource being requested (which would be blogs in /blogs and articles in /blogs/1/articles), 
-filtering on included collections can be done using bracket notation:
+filtering on to-many relationships can be done using bracket notation:
 
 ```http
-GET /articles?include=author,tags&filter=equals(author.lastName,'Smith')&filter[tags]=contains(label,'tech','design') HTTP/1.1
+GET /articles?include=author,tags&filter=equals(author.lastName,'Smith')&filter[tags]=any(label,'tech','design') HTTP/1.1
 ```
 
 In the above request, the first filter is applied on the collection of articles, while the second one is applied on the nested collection of tags.
 
+Note this does **not** hide articles without any matching tags! Use the `has` function with a filter condition (see below) to accomplish that.
+
 Putting it all together, you can build quite complex filters, such as:
 
 ```http
@@ -112,7 +114,7 @@ Examples can be found in the table below.
 
 Filters can be combined and will be applied using an OR operator. This used to be AND in versions prior to v4.0.
 
-Attributes to filter on can optionally be prefixed with a HasOne relationship, for example:
+Attributes to filter on can optionally be prefixed with to-one relationships, for example:
 
 ```http
 GET /api/articles?include=author&filter[caption]=like:marketing&filter[author.lastName]=Smith HTTP/1.1