applecamerad, sntpd: add page (#7005)

pages/osx/applecamerad.md

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+# applecamerad
+
+> Camera manager.
+> It should not be invoked manually.
+
+- Start the daemon:
+
+`applecamerad`

pages/osx/sntpd.md

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+# sntpd
+
+> An SNTP server.
+> It should not be invoked manually.
+
+- Start the daemon:
+
+`sntpd`
+
+- Overwrite existing state with the local clock (stratum 1), for running a master/primary server, without synchronizing with another (higher stratum) server:
+
+`sntpd -L`
+
+- Use a custom file for the SNTP state:
+
+`sntpd -z {{path/to/state.bin}}`