Update capacity-modes.mdx (#4369)

Updating the RPS included per TRU in line with https://www.notion.so/temporalio/DR-60-Update-R-A-Ratio-on-TRUs-to-3-1-3198fc5677388071838ad0f90a594a5f?source=copy_link

Co-authored-by: Brian MacDonald <[email protected]>

Author: tlotemporal

docs/cloud/capacity-modes.mdx

@@ -143,7 +143,7 @@ Provisioned Capacity provides an alternative to On-Demand Capacity by allowing y
 
 |               | Actions Per Second | Requests Per Second | Operations Per Second|
 |---------------|--------------------|---------------------|----------------------|
-| TRU           | 500                | 2000                | 4000                 |
+| TRU           | 500                | 1500                | 4000                 |
 
 Customers can set 2, 3, 4, 6, 8, 10, 12 TRUs, subject to availability. TRUs can be adjusted hourly.