DOCS-15911-update-chunkMigrationConcurrency (#2604)

* DOCS-15911-update-chunkMigrationConcurrency

* DOCS-15911-update-chunkMigrationConcurrency

* DOCS-15911-update-chunkMigrationConcurrency

* DOCS-15911-update-chunkMigrationConcurrency

* DOCS-15911-update-chunkMigrationConcurrency

---------

Co-authored-by: jason-price-mongodb <[email protected]>

Author: jason-price-mongodb

source/reference/command/serverStatus.txt

@@ -4287,7 +4287,7 @@ shardingStatistics
 
    *Only present when run on a shard.*
 
-   *Available starting in MongoDB 6.3 (and 6.0.5 and 5.0.16)*
+   *Available starting in MongoDB 6.3 (and 6.0.5 and 5.0.15).*
 
 .. serverstatus:: shardingStatistics.catalogCache
 

source/reference/parameters.txt

@@ -3013,7 +3013,7 @@ Sharding Parameters
 
 .. parameter:: chunkMigrationConcurrency
 
-   *Available starting in MongoDB 6.3 (and 6.0.5 and 5.0.16)*
+   *Available starting in MongoDB 6.3 (and 6.0.5 and 5.0.15).*
 
    *Type*: integer
 
@@ -3029,8 +3029,11 @@ Sharding Parameters
    also increases the workload and disk IOPS usage on the the source
    shard and the receiving shard.
 
-   Maximum value is 500. You should typically use fewer than 32 threads
-   unless you are using NVMe (Non-Volatile Memory Express) disks.
+   Maximum value is 500.
+   
+   You should typically use half the total number of CPU cores as
+   threads. For example, if the total is 16 cores, set
+   ``chunkMigrationConcurrency`` to 8 threads (or fewer).
 
    If ``chunkMigrationConcurrency`` is greater than ``1``, the
    ``_secondaryThrottle`` configuration setting is ignored. The