docs(conf.py): clarify llms_txt_file comment points to _templates source

The pre-existing comment said "keep curated render via setup hook" but
didn't say where the source template lives. After moving llms.txt off
`html_extra_path` and onto a build-time render, point readers explicitly
at `_templates/llms.txt.j2` and `_write_llms_txt()` so future updates
land in the right place.

Addresses Copilot review feedback on PR #1874.

🤖 Generated by [robots](https://vyos.io)

1 files changed, 4 insertions, 2 deletions

diff --git a/docs/conf.py b/docs/conf.py
index 99c4ee70..e9b28b71 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -118,8 +118,10 @@ html_baseurl = 'https://docs.vyos.io/en/rolling/'
 # sphinx-sitemap: baseurl already includes /en/rolling/, so skip lang+version
 sitemap_url_scheme = '{link}'
 
-# sphinx-llms-txt: disable auto-generated llms.txt, keep curated render via
-# setup hook; llms-full.txt is still auto-generated
+# sphinx-llms-txt: disable the package's auto-generated index llms.txt.
+# The curated llms.txt is rendered at build time from
+# _templates/llms.txt.j2 by the _write_llms_txt() build-finished hook
+# below; llms-full.txt is still auto-generated by sphinx-llms-txt.
 llms_txt_file = False
 
 # Custom sidebar templates, must be a dictionary that maps document names