Type aliases with template parameters are rendered wrong

Example: https://www.boost.org/doc/libs/master/libs/mysql/doc/html/mysql/ref/boost__mysql__metadata_collection_view.html

`metadata_collection_view` is defined as a type alias for `boost::span`, where `metadata` is an object defined by MySQL. I'd expect the reference page to only show the type alias, but it's also listing the member functions for `metadata`.

A slightly less clean example: https://www.boost.org/doc/libs/1_81_0/libs/beast/doc/html/beast/ref/boost__beast__http__file_body.html
Where the member functions section contains functions from the `file` class.

If no member functions are defined for the type in the `span`, everything works fine though:
https://www.boost.org/doc/libs/master/libs/mysql/doc/html/mysql/ref/boost__mysql__blob_view.html