kill.md: change signal explanation (closes #616) (#998)

* add kill signal

* 修改kill相关信号的注释

* kill.md: improve descriptions and formatting

* kill.md: move dashes to outside the tokens

pages/common/kill.md

@@ -1,12 +1,28 @@
 # kill
 
-> Sends a signal to a process.
-> Mostly used for stopping processes.
+> Sends a signal to a process, usually related to stopping the process.
+> All signals except for SIGKILL and SIGSTOP can be intercepted by the process to perform a clean exit.
 
-- Kill the process:
+- Terminate a program using the default SIGTERM (terminate) signal:
 
 `kill {{process_id}}`
 
-- List signal names:
+- List available signal names (to be used without the `SIG` prefix):
 
 `kill -l`
+
+- Terminate a program using the SIGHUP (hang up) signal. Many daemons will reload instead of terminating:
+
+`kill -{{1|HUP}} {{process_id}}`
+
+- Terminate a program using the SIGINT (interrupt) signal. This is typically initiated by the user pressing `Ctrl+C`:
+
+`kill -{{2|INT}} {{process_id}}`
+
+- Signal the operating system to immediately terminate a program (which gets no chance to capture the signal):
+
+`kill -{{9|KILL}} {{process_id}}`
+
+- Signal the operating system to pause a program, it until a SIGCONT ("continue") signal is received:
+
+`kill -{{17|STOP}} {{process_id}}`