Improving rationale on the libnss lintian overrides pt. 2

debian/libnss-aad.lintian-overrides

@@ -5,4 +5,5 @@ libnss-aad: lacks-versioned-link-to-shared-library
 # is still being tracked at https://github.com/rust-lang/cargo/issues/9778. Therefore, we must build
 # it with the base name (i.e. libnss_aad.so) and then manually rename it to contain the version, as
 # done in the dh_auto_install step.
+# With this approach, libnss is not using soname to track compatibility, so this override is safe.
 libnss-aad: shared-library-lacks-version