fix a punctuation mark

Author: amsliu

support/azure/virtual-machines/linux/serial-console-nmi-sysrq.md

@@ -68,7 +68,7 @@ From the SysRq Admin Guide:
 |``k``  |   Secure Access Key (SAK) that kills all programs on the current virtual console.
 |``l``  |   Shows a stack backtrace for all active CPUs.
 |``m``  |   Dumps current memory information to your console.
-|``n``  |   Allows real-time (RT) tasks to be reprioritized using the nice value. NOTE: The nice value controls a process’s priority for CPU scheduling, where lower values indicate higher priority.
+|``n``  |   Allows real-time (RT) tasks to be reprioritized using the nice value. NOTE: The nice value controls a process's priority for CPU scheduling, where lower values indicate higher priority.
 |``o``  |   Shuts off your system (if configured and supported).
 |``p``  |   Dumps the current registers and flags to your console.
 |``q``  |   Dumps CPU lists of all armed hrtimers (but not regular timer_list timers) and detailed information about all clockevent devices.