jar: add jar listing options examples (#2299)

pages/common/jar.md

@@ -4,4 +4,12 @@
 
 - Unzip .jar/.war file to the current directory:
 
-`jar -xvf *.jar`
+`jar -xvf {{file.jar}}`
+
+- List a .jar/.war file content:
+
+`jar tf {{path/to/file.jar}}`
+
+- List a .jar/.war file content with verbose output:
+
+`jar tvf {{path/to/file.jar}}`