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updated shard limit doc (#56496) (#61509) 

* updated shard limit doc

As the documentation was not so clear. I have updated saying this limit includes open indices with unassigned primaries and replicas count towards the limit.

* [DOCS] Incorporated edits.

Co-authored-by: Deb Adair <debadair@elastic.co>

Co-authored-by: gadekishore <50092970+gadekishore@users.noreply.github.com>
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@ -45,20 +45,20 @@ either the limit is increased as described below, or some indices are
<<indices-open-close,closed>> or <<indices-delete-index,deleted>> to bring the
number of shards below the limit.
Replicas count towards this limit, but closed indexes do not. An index with 5
primary shards and 2 replicas will be counted as 15 shards. Any closed index
is counted as 0, no matter how many shards and replicas it contains.
The cluster shard limit defaults to 1,000 shards per data node.
Both primary and replica shards of all open indices count toward the limit,
including unassigned shards.
For example, an open index with 5 primary shards and 2 replicas counts as 15 shards.
Closed indices do not contribute to the shard count.
The limit defaults to 1,000 shards per data node, and can be dynamically
adjusted using the following property:
You can dynamically adjust the cluster shard limit with the following property:
`cluster.max_shards_per_node`::
Controls the number of shards allowed in the cluster per data node.
For example, a 3-node cluster with the default setting would allow 3,000 shards
total, across all open indexes. If the above setting is changed to 500, then
the cluster would allow 1,500 shards total.
With the default setting, a 3-node cluster allows 3,000 shards total, across all open indexes.
If you reduce the limit to 500, the cluster would allow 1,500 shards total.
NOTE: If there are no data nodes in the cluster, the limit will not be enforced.
This allows the creation of indices during cluster creation if dedicated master