doc missing for filtering entries by taxonomy

[dadaxr]

There is no doc about how to filter collection entries based on a mapped taxonomy.

There is a quick mention to the existence of two methods "whereTaxonomy" and "whereTaxonomyIn" but no examples of how to use it. IMHO, we should mention them in the https://statamic.dev/repositories/entry-repository#querying doc page, with some examples.

It took me a while to understand we should follow this format :

Entry::query()
    ->where('collection', 'blog')
    ->whereTaxonomy('tag::holidays') //here "tag" is the taxonomy id, and "holidays" the term id
    ->get();

Entry::query()
    ->where('collection', 'blog')
    ->whereTaxonomyIn(["tag::holidays","tag::news"]) // == entries having either a "holidays" tag OR a "news" tag
    ->get();

It could also be great to mention that only works if the "taxonomy id" (ie "tag" in the above example), match a field "named" tag in the collection blueprint. If it does not, the "whereJsonContains" workaround could also be documented : statamic/cms#4098 (comment)