Formatted all pages according to guidelines.

pages/linux/timedatectl.md

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 # timedatectl
 
-> Control the system time and date
+> Control the system time and date.
 
-- To check the current system clock time
+- To check the current system clock time:
 
 `timedatectl`
 
-- To set the local time of the system clock directly
+- To set the local time of the system clock directly:
 
 `timedatectl set-time {{"yyyy-MM-dd hh:mm:ss"}}`
 
-- To list available timezones
+- To list available timezones:
 
 `timedatectl list-timezones`
 
-- To change timezones
+- To change timezones:
 
 `timedatectl set-timezone {{timezone}}`