[8.10] [DOCS] Makes shards optional in Create pack API (#166639) (#16…

…7135)

# Backport

This will backport the following commits from `main` to `8.10`:
- [[DOCS] Makes shards optional in Create pack API
(#166639)](#166639)

<!--- Backport version: 8.9.7 -->

### Questions ?
Please refer to the [Backport tool
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<!--BACKPORT
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Makes shards optional in Create pack API (#166639)\n\n##
Summary\r\n\r\n* Resolves
elastic/security-docs#3822. \r\n\r\n* Updates
the `shards` object in Create pack API to optional for 8.10.1\r\nand
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Makes shards optional in Create pack API (#166639)\n\n##
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the `shards` object in Create pack API to optional for 8.10.1\r\nand
8.11.0 onwards, per
https://github.com/elastic/kibana/pull/166178\r\n\r\n* Related to
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Makes shards optional in Create pack API (#166639)\n\n##
Summary\r\n\r\n* Resolves
elastic/security-docs#3822. \r\n\r\n* Updates
the `shards` object in Create pack API to optional for 8.10.1\r\nand
8.11.0 onwards, per
https://github.com/elastic/kibana/pull/166178\r\n\r\n* Related to
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Co-authored-by: natasha-moore-elastic <[email protected]>

docs/api/osquery-manager/packs/create.asciidoc

@@ -33,7 +33,7 @@ experimental[] Create packs.
 
 `policy_ids`:: (Optional, array) A list of agents policy IDs.
 
-`shards`:: (Required, object) An object with shard configuration for policies included in the pack. For each policy, set the shard configuration to a percentage (1–100) of target hosts.
+`shards`:: (Optional, object) An object with shard configuration for policies included in the pack. For each policy, set the shard configuration to a percentage (1–100) of target hosts.
 
 `queries`:: (Required, object) An object of queries.