Export of internal Abseil changes.

--
02313145821172a55b1cda543868be5e986de591 by Tom Manshreck <shreck@google.com>:

Internal change

PiperOrigin-RevId: 209992038
GitOrigin-RevId: 02313145821172a55b1cda543868be5e986de591
Change-Id: Iadab8fb89daa467d8e0cb8e3d38ae058c77c5b38

absl/time/time.h

@@ -25,16 +25,6 @@
 //  * `absl::TimeZone` defines geopolitical time zone regions (as collected
 //     within the IANA Time Zone database (https://www.iana.org/time-zones)).
 //
-// Note: Absolute times are distinct from civil times, which refer to the
-// human-scale time commonly represented by `YYYY-MM-DD hh:mm:ss`. The mapping
-// between absolute and civil times can be specified by use of time zones
-// (`absl::TimeZone` within this API). That is:
-//
-//    Civil Time = F(Absolute Time, Time Zone)
-//    Absolute Time = F(Civil Time, Time Zone)
-//
-// See civil_time.h for abstractions related to constructing and manipulating
-// civil time.
 //
 // Example:
 //