Document whereTaxonomy and whereInTaxonomy for the TermRepository

thoses 2 methods are not documented : 

<img width="475" height="290" alt="Image" src="https://github.com/user-attachments/assets/fa7cd7dd-9dc6-412b-b59d-5f6dd89d1127" />

there is nothing here : https://statamic.dev/backend-apis/resource-apis/term-repository




