_content/doc/go1.23: document Windows timers resulution improvements

I missed to add timer resolution improvements in the release notes for
Go 1.23. This is a significant change, so better late than never.

For golang/go#44343

Change-Id: I7fe22a1752a45df9094d5233bed762823322c7a9
Reviewed-on: https://go-review.googlesource.com/c/website/+/614435
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>

_content/doc/go1.23.md

@@ -564,6 +564,9 @@ Templates now support the new "else with" action, which reduces template complex
 [`Parse`](/pkg/time#Parse) and [`ParseInLocation`](/pkg/time#ParseInLocation) now return an error if the time zone
 offset is out of range.
 
+On Windows, [`Timer`](/pkg/time#Timer), [`Ticker`](/pkg/time#Ticker), and functions that put the goroutine to sleep,
+such as [`Sleep`](/pkg/time#Sleep), got their time resolution improved to 0.5ms instead of 15.6ms.
+
 #### [`unicode/utf16`](/pkg/unicode/utf16/)
 
 The [`RuneLen`](/pkg/unicode/utf16#RuneLen) function returns the number of 16-bit words in