Merge pull request #2 from WiSaGaN/patch-1

Fix typo

Author: wycats

text/0000-time-improvements.md

@@ -170,7 +170,7 @@ impl ProcessTime {
   /// Panics if `earlier` is later than &self.
   /// Because ProcessTime is monotonic, the only time that `earlier` should be
   /// a later time is a bug in your code.
-  pub fn duration_from_earlier(&self, earlier: ProcessTime) -> ProcessTime;
+  pub fn duration_from_earlier(&self, earlier: ProcessTime) -> Duration;
 
   /// Panics if self is later than the current time (can happen if a ProcessTime
   /// is produced synthetically)
@@ -327,4 +327,4 @@ use `duration_from_earlier` reliably to get a positive `Duration`.
 What should `SystemTimeError` look like?
 
 This RFC leaves types related to human representations of dates and times
-to a future proposal.
+to a future proposal.