Update triagebot [rendered-link] documentation

Author: Urgau

src/triagebot/rendered-link.md

@@ -9,9 +9,12 @@ This feature is enabled on a repository by having a `[rendered-link]` table in `
 ```toml
 [rendered-link]
 trigger-files = ["posts/"]
+exclude-files = ["posts/SUMMARY.md"]
 ```
 
-The `trigger-files` key configures which directories are watched for modification, with the "Rendered link" pointing to the first file matching.
+The `trigger-files` key configures which directories are watched for modification, with the `exclude-files` key to exclude files or directories.
+
+The "Rendered link" will point to the matching file with the most modifications.
 
 ## Implementation