Terminology fixes

Author: bcarthic

articles/healthcare-apis/dicom/external-metadata.md

@@ -15,7 +15,7 @@ The external metadata feature allows users to store metadata or additional infor
 
 ## Limitations
 
-- External metadata is only supported in latest api version. i.e., Version 2 or above
+- External metadata is only supported in latest API version. That is, Version 2 or above
 - External metadata is only supported in [DICOM® service with Azure Data Lake Storage](dicom-data-lake.md)
 - Only tags which don't conform with standard DICOM protocol tags such as [private tags](https://dicom.nema.org/dicom/2013/output/chtml/part05/sect_7.8.html) are supported to be as external metadata.
 - Only study level tags are supported.