Update DateTime.xml (#4299)

* Update DateTime.xml

Author: AlanLiu90

xml/System/DateTime.xml

@@ -7119,7 +7119,7 @@ This member is an explicit interface member implementation. It can be used only
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 ## Remarks  
- A single tick represents one hundred nanoseconds or one ten-millionth of a second. There are 10,000 ticks in a millisecond, or 10 million ticks in a second.  
+ A single tick represents one hundred nanoseconds or one ten-millionth of a second. There are 10,000 ticks in a millisecond (see <xref:System.TimeSpan.TicksPerMillisecond>) and 10 million ticks in a second.  
 
 The value of this property represents the number of 100-nanosecond intervals that have elapsed since 12:00:00 midnight, January 1, 0001 in the Gregorian calendar, which represents <xref:System.DateTime.MinValue>. It does not include the number of ticks that are attributable to leap seconds.
 If the DateTime object has its `Kind` property set to `Local`, its ticks represent the time elapsed time since 12:00:00 midnight, January 1, 0001 in the local time as specified by the current time zone setting.