chronyc, ntpq: add page (#5828)

pages/linux/chronyc.md

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+# chronyc
+
+> Query the Chrony NTP daemon.
+> More information: <https://chrony.tuxfamily.org/doc/4.0/chronyc.html>.
+
+- Start chronyc in interactive mode:
+
+`chronyc`
+
+- Display tracking stats for the Chrony daemon:
+
+`chronyc tracking`
+
+- Print the time sources that Chrony is currently using:
+
+`chronyc sources`
+
+- Display stats for sources currently used by chrony daemon as a time source:
+
+`chronyc sourcestats`
+
+- Step the system clock immediately, bypassing any slewing:
+
+`chronyc makestep`
+
+- Display verbose information about each NTP source:
+
+`chronyc ntpdata`

pages/linux/ntpq.md

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+# ntpq
+
+> Query the Network Time Protocol (NTP) daemon.
+> More information: <https://www.eecis.udel.edu/~mills/ntp/html/ntpq.html>.
+
+- Start `ntpq` in interactive mode:
+
+`ntpq --interactive`
+
+- Print a list of NTP peers:
+
+`ntpq --peers`
+
+- Print a list of NTP peers without resolving hostnames from IP addresses:
+
+`ntpq --numeric --peers`
+
+- Use `ntpq` in debugging mode:
+
+`ntpq --debug-level`
+
+- Print NTP system variables values:
+
+`ntpq --command={{rv}}`