Fix Document Suggestion helper documentation platform side

When adding a document suggestion widget and when you want to use a NXQL query, the helper says:

NXQL Query to fetch the suggestions. This property is ignored if a Page Provider name is given.
Example: select * from Document where dc:title LIKE ?

The widget appends a '%' wildcard to the parameter passed to query.

It is not true anymore since NXP-17817. (6.0-HF20)

The widget does not appends a '%' wildcard to the parameter passed to query anymore.

The '%' has to be added in the query or in the page provider query pattern.