docs(opensearch): Clarify engine version examples in input documentation

Author: younsl

README.md

@@ -217,7 +217,7 @@ No modules.
 | <a name="input_ebs_options"></a> [ebs\_options](#input\_ebs\_options) | Configuration block for EBS related options, may be required based on chosen [instance size](https://aws.amazon.com/elasticsearch-service/pricing/) | `any` | <pre>{<br/>  "ebs_enabled": true,<br/>  "volume_size": 64,<br/>  "volume_type": "gp3"<br/>}</pre> | no |
 | <a name="input_enable_access_policy"></a> [enable\_access\_policy](#input\_enable\_access\_policy) | Determines whether an access policy will be applied to the domain | `bool` | `true` | no |
 | <a name="input_encrypt_at_rest"></a> [encrypt\_at\_rest](#input\_encrypt\_at\_rest) | Configuration block for encrypting at rest | `any` | <pre>{<br/>  "enabled": true<br/>}</pre> | no |
-| <a name="input_engine_version"></a> [engine\_version](#input\_engine\_version) | Version of the OpenSearch engine to use | `string` | `null` | no |
+| <a name="input_engine_version"></a> [engine\_version](#input\_engine\_version) | Version of the OpenSearch engine to use. For example, `OpenSearch_2.11` or `Elasticsearch_7.9`. | `string` | `null` | no |
 | <a name="input_ip_address_type"></a> [ip\_address\_type](#input\_ip\_address\_type) | The IP address type for the endpoint. Valid values are ipv4 and dualstack | `string` | `null` | no |
 | <a name="input_log_publishing_options"></a> [log\_publishing\_options](#input\_log\_publishing\_options) | Configuration block for publishing slow and application logs to CloudWatch Logs. This block can be declared multiple times, for each log\_type, within the same resource | `any` | <pre>[<br/>  {<br/>    "log_type": "INDEX_SLOW_LOGS"<br/>  },<br/>  {<br/>    "log_type": "SEARCH_SLOW_LOGS"<br/>  }<br/>]</pre> | no |
 | <a name="input_node_to_node_encryption"></a> [node\_to\_node\_encryption](#input\_node\_to\_node\_encryption) | Configuration block for node-to-node encryption options | `any` | <pre>{<br/>  "enabled": true<br/>}</pre> | no |