docs: Issue on page Materialized View

[swasik]

I would like to report an issue on page https://java-driver.docs.scylladb.com/scylla-4.15.0.x/manual/query_builder/schema/materialized_view/index

Problem

The link to RelationStructure (https://java-driver.docs.scylladb.com/scylla-4.15.0.x/api/com/datastax/oss/driver/api/querybuilder/schema/RelationStructure.html) that is used in several places on this web page does not work.

Suggest a fix

[Bouncheck]

Will be resolved by #542