Sets the search phrase to search for.
The query() function provides an alternate method for setting the search phrase for your search. Instead
of setting the search phrase directly as a parameter of the search() function,
you can set the search phrase using the query() function chained to a WixSearchBuilder.
Setting the search phrase with query() allows you to build searches dynamically. For example,
you could use a different search phrase depending on whether a specific condition is met.
The phrase to run the search on.