Clarify 'timezone' field description in SLO correction

Updated the description of the 'timezone' field for clarity

Author: mfu00

docs/resources/slo_correction.md

@@ -65,7 +65,7 @@ resource "datadog_slo_correction" "example_slo_correction_with_recurrence" {
 - `duration` (Number) Length of time in seconds for a specified `rrule` recurring SLO correction (required if specifying `rrule`)
 - `end` (Number) Ending time of the correction in epoch seconds. Required for one time corrections, but optional if `rrule` is specified
 - `rrule` (String) Recurrence rules as defined in the iCalendar RFC 5545. Supported rules for SLO corrections are `FREQ`, `INTERVAL`, `COUNT` and `UNTIL`.
-- `timezone` (String) The timezone to display in the UI for the correction times (defaults to "UTC")
+- `timezone` (String) The timezone used in the UI for correction times. Prefer IANA timezone name format (e.g., "America/Los_Angeles", "Europe/Paris"), but common standard abbreviations are supported. Defaults to "UTC".
 
 ### Read-Only