Update AGENTS.md

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

AGENTS.md

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 # IoTDB Java Code Style Guide
 
-This document defines the coding rules that **must** be followed when generating or modifying Java code in this project. These rules are enforced by CheckStyle (`checkstyle.xml`) and Spotless (`pom.xml`).
+This document defines the coding rules that **must** be followed when generating or modifying Java code in this project. Many of these rules are enforced by CheckStyle (`checkstyle.xml`) and Spotless (`pom.xml`), while others are conventions that contributors are expected to follow.
 
 ## Imports