fix typo in readme

Author: Phil Varner

README.md

@@ -521,8 +521,8 @@ There are some settings that should be reviewed and updated as needeed in the se
 | OPENSEARCH_USERNAME              | The username to authenticate to OpenSearch when AWS Secrets Manager is not used.                                                                                                                 |                                                                                      |
 | OPENSEARCH_PASSWORD              | The password to authenticate to OpenSearch when AWS Secrets Manager is not used.                                                                                                                 |                                                                                      |
 | COLLECTION_TO_INDEX_MAPPINGS     | A JSON object representing collection id to index name mappings if they do not have the same names.                                                                                              |                                                                                      |
-| ITEMS_INDICIES_NUM_OF_SHARDS                | Configure the number of shards for the indices that contain Items.                                                                                                                                  | none                                                                                |
-| ITEMS_INDICIES_NUM_OF_REPLICAS                | Configure the number of replicas for the indices that contain Items.                                                                                                                                                                              | none                                                                                |
+| ITEMS_INDICIES_NUM_OF_SHARDS     | Configure the number of shards for the indices that contain Items.                                                                                                                               | none                                                                                 |
+| ITEMS_INDICIES_NUM_OF_REPLICAS   | Configure the number of replicas for the indices that contain Items.                                                                                                                             | none                                                                                 |
 
 The preferred mechanism for populating the OpenSearch credentials to stac-server is to
 create a secret in AWS Secret Manager that contains the username and password.