deploy.sh: keep the relink comment free of a literal loop-var token

The explanatory comment contained an unescaped loop-variable token, which
the local shell (set -u) tried to expand while building the double-quoted
remote script ('unit: unbound variable'). Reword the comment.

scripts/deploy.sh

@@ -219,9 +219,10 @@ fi
 
 echo '[4/5] Relinking LLM units and restarting LLM services...'
 for unit in ${LLM_UNITS[$TARGET]}; do
-  # No quotes around the path: ${unit} must expand on the remote (the path
-  # has no spaces). Quoting it would ship a literal ${unit} and create a
-  # dangling symlink (2026-08-22 bug).
+  # The loop variable must expand on the remote, so it is escaped here and
+  # the path is unquoted (it has no spaces). Quoting the source path would
+  # ship a literal loop-variable token and create a dangling symlink
+  # (the 2026-08-22 relink bug).
   ${SUDO} ln -sf ${REMOTE_DIR[$TARGET]}/scripts/\${unit}.service /etc/systemd/system/\${unit}.service
 done
 ${SUDO} systemctl daemon-reload