Update time series limitations for 5.0.6 (#231)

* Update time series limitations for 5.0.5

* remove reference to split chunk

Author: jeff-allen-mongo

source/core/timeseries/timeseries-limitations.txt

@@ -133,8 +133,16 @@ Client-Side Field Level Encryption
 Sharding
 ~~~~~~~~
 
-:ref:`Time series collections <manual-timeseries-collection>` cannot
-currently be sharded.
+Starting in MongoDB 5.0.6, sharded time series collections are supported.
+When using sharded time series collections, you cannot:
+
+- Modify the ``granularity`` of a sharded time series
+  collection.
+
+- Run sharding administration commands, such as :dbcommand:`moveChunk`.
+
+In versions earlier than MongoDB 5.0.6, you cannot shard time series
+collections.
 
 Aggregation $out and $merge
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~