Update README.md (#565)

Co-authored-by: Abigail Hartman <[email protected]>

README.md

@@ -214,7 +214,7 @@ Note: settings starting with `AZURE_SEARCH` are only needed when using Azure Ope
 |AZURE_SEARCH_TOP_K|5|The number of documents to retrieve from Azure AI Search.|
 |AZURE_SEARCH_ENABLE_IN_DOMAIN|True|Limits responses to only queries relating to your data.|
 |AZURE_SEARCH_CONTENT_COLUMNS||List of fields in your Azure AI Search index that contains the text content of your documents to use when formulating a bot response. Represent these as a string joined with "|", e.g. `"product_description|product_manual"`|
-|AZURE_SEARCH_FILENAME_COLUMN|| Field from your Azure AI Search index that gives a unique idenitfier of the source of your data to display in the UI.|
+|AZURE_SEARCH_FILENAME_COLUMN|| Field from your Azure AI Search index that gives a unique identifier of the source of your data to display in the UI.|
 |AZURE_SEARCH_TITLE_COLUMN||Field from your Azure AI Search index that gives a relevant title or header for your data content to display in the UI.|
 |AZURE_SEARCH_URL_COLUMN||Field from your Azure AI Search index that contains a URL for the document, e.g. an Azure Blob Storage URI. This value is not currently used.|
 |AZURE_SEARCH_VECTOR_COLUMNS||List of fields in your Azure AI Search index that contain vector embeddings of your documents to use when formulating a bot response. Represent these as a string joined with "|", e.g. `"product_description|product_manual"`|