Document .well-known paths for llms.txt files

[mintlify]

Summary

• Documents that llms.txt and llms-full.txt files are also available at .well-known paths for compatibility with tools that follow the .well-known convention

Triggered by: mintlify/mint#6448 (Add Mintlify attribution signals for LLM and crawler visibility)

---

Note

Low Risk
Low risk documentation-only change that clarifies an additional hosted path; no code or behavior changes.

Overview
Updates the llms-full.txt documentation to note it is available not only at /llms-full.txt but also at /.well-known/llms-full.txt for .well-known-convention compatibility.

^{Written by Cursor Bugbot for commit 399eaab. This will update automatically on new commits. Configure here.}