Updated windows time period call

Updated win32.time_begin_period to windows.timeBeginPeriod
Added a note about calling windows.timeEndPeriod once you don't need accurate_sleep, as per MS's docs https://learn.microsoft.com/en-us/windows/win32/api/timeapi/nf-timeapi-timebeginperiod#remarks

core/time/time.odin

@@ -238,8 +238,9 @@ time_add :: proc "contextless" (t: Time, d: Duration) -> Time {
 //
 // Accuracy seems to be pretty good out of the box on Linux, to within around 4µs worst case.
 // On Windows it depends but is comparable with regular sleep in the worst case.
-// To get the same kind of accuracy as on Linux, have your program call `win32.time_begin_period(1)` to
+// To get the same kind of accuracy as on Linux, have your program call `windows.timeBeginPeriod(1)` to
 // tell Windows to use a more accurate timer for your process.
+// Additionally your program should call `windows.timeEndPeriod(1)` when you're done.
 accurate_sleep :: proc "contextless" (d: Duration) {
 	to_sleep, estimate, mean, m2, count: Duration