Jason Tedor 00356edd33 Clarify time units usage in docs
This commit clarifies the distinction between supported time units for
durations and supported time units for durations in the docs.

Relates #19159
2016-06-29 17:02:15 -04:00
..
2016-06-29 17:02:15 -04:00
2016-04-22 10:54:25 -06:00