*: update command placeholder (#10249)

*: replace 'some_command' with 'command'

pages/common/ts.md

@@ -5,15 +5,15 @@
 
 - Add a timestamp to the beginning of each line:
 
-`{{some_command}} | ts`
+`{{command}} | ts`
 
 - Add timestamps with microsecond precision:
 
-`{{some_command}} | ts "{{%b %d %H:%M:%.S}}"`
+`{{command}} | ts "{{%b %d %H:%M:%.S}}"`
 
 - Add [i]ncremental timestamps with microsecond precision, starting from zero:
 
-`{{some_command}} | ts -i "{{%H:%M:%.S}}"`
+`{{command}} | ts -i "{{%H:%M:%.S}}"`
 
 - Convert existing timestamps in a text file (eg. a log file) into [r]elative format: