MFC r208273: Add a sentence to the man page explaining that the -d option can only be used when ntpd is compiled with DEBUG support.
MFC r208273:
Add a sentence to the man page explaining that the -d option
can only be used when ntpd is compiled with DEBUG support.

PR:             docs/138206
Submitted by:   Oliver Pinter (oliver dot pntr at gmail dot com)
Approved by:    roberto

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