Update docs (#1839)

scripts/killall_sglang.sh

@@ -1,2 +1,6 @@
+"""
+Kill all SGLang processes and free the GPU memory.
+"""
+
 kill -9 $(ps aux | grep 'multiprocessing.spawn' | grep -v 'grep' | awk '{print $2}')
 kill -9 $(ps aux | grep 'sglang.launch_server' | grep -v 'grep' | awk '{print $2}')