Added missing word

Author: hmacgregor1

articles/search/search-howto-index-azure-data-lake-storage.md

@@ -127,7 +127,7 @@ In a [search index](search-what-is-an-index.md), add fields to accept the conten
 
    + A custom metadata property that you add to blobs. This option requires that your blob upload process adds that metadata property to all blobs. Since the key is a required property, any blobs that are missing a value will fail to be indexed. If you use a custom metadata property as a key, avoid making changes to that property. Indexers will add duplicate documents for the same blob if the key property changes.
 
-1. Add a "content" field to store extracted text from each file through the blob's "content" property. You aren't required to use this name, but doing lets you take advantage of implicit field mappings. 
+1. Add a "content" field to store extracted text from each file through the blob's "content" property. You aren't required to use this name, but doing so lets you take advantage of implicit field mappings. 
 
 1. Add fields for standard metadata properties. The indexer can read custom metadata properties, [standard metadata](#indexing-blob-metadata) properties, and [content-specific metadata](search-blob-metadata-properties.md) properties.