Export of internal Abseil changes.

--
f4bb8afa9376b4120f56f3beff7b07260da4a5c2 by CJ Johnson <johnsoncj@google.com>:

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PiperOrigin-RevId: 209630262
GitOrigin-RevId: f4bb8afa9376b4120f56f3beff7b07260da4a5c2
Change-Id: I3fedf35011d805ee4a20b92e073b43523b47d15b

absl/time/internal/cctz/src/time_zone_format.cc

@@ -533,7 +533,7 @@ const char* ParseSubSeconds(const char* dp, detail::femtoseconds* subseconds) {
   return dp;
 }
 
-// Parses a std::string into a std::tm using strptime(3).
+// Parses a string into a std::tm using strptime(3).
 const char* ParseTM(const char* dp, const char* fmt, std::tm* tm) {
   if (dp != nullptr) {
     dp = strptime(dp, fmt, tm);

absl/time/internal/cctz/src/time_zone_info.cc

@@ -286,7 +286,7 @@ bool TimeZoneInfo::EquivTransitions(std::uint_fast8_t tt1_index,
   return true;
 }
 
-// Use the POSIX-TZ-environment-variable-style std::string to handle times
+// Use the POSIX-TZ-environment-variable-style string to handle times
 // in years after the last transition stored in the zoneinfo data.
 void TimeZoneInfo::ExtendTransitions(const std::string& name,
                                      const Header& hdr) {

absl/time/internal/cctz/src/time_zone_posix.h

@@ -89,7 +89,7 @@ struct PosixTransition {
   } time;
 };
 
-// The entirety of a POSIX-std::string specified time-zone rule. The standard
+// The entirety of a POSIX-string specified time-zone rule. The standard
 // abbreviation and offset are always given. If the time zone includes
 // daylight saving, then the daylight abbrevation is non-empty and the
 // remaining fields are also valid. Note that the start/end transitions