Document the strptime %s change.

Bug: https://issuetracker.google.com/37128336
Test: N/A
Change-Id: I9b35c14d84b9f4ec85b9d54af47314d0442ebde2
diff --git a/docs/status.md b/docs/status.md
index 2666e58..8252850 100644
--- a/docs/status.md
+++ b/docs/status.md
@@ -55,6 +55,7 @@
   * `syncfs`
   * `%C` and `%S` support in the printf family (previously only the wprintf family supported these)
   * `%mc`/`%ms`/`%m[` support in the scanf family
+  * `%s` support in strptime (strftime already supported it)
 
 New libc functions in O:
   * `sendto` FORTIFY support