Update readme.md

Author: VasiyaKrishnan

samples/demos/azure-sql-edge-demos/readme.md

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 In this folder you will find the below files to run the [Iron Ore Silica Impurities Demo](https://docs.microsoft.com/en-us/azure/azure-sql-edge/tutorial-deploy-azure-resources)
 1. DACPAC or Data Tier AppliCation Package is a single file which contains database model i.e. all files represent database objects. This file can be downloaded [here](https://github.com/microsoft/sql-server-samples/tree/master/samples/demos/azure-sql-edge-demos/iron-ore-silica-impurities/DACPAC).
-2. The ARM/AMD docker image files that need to be pushed to teh conatiner registry can be downloaded [here](https://github.com/microsoft/sql-server-samples/tree/master/samples/demos/azure-sql-edge-demos/iron-ore-silica-impurities/tar-files). 
+2. The ARM/AMD docker image files that need to be pushed to the conatiner registry can be downloaded [here](https://github.com/microsoft/sql-server-samples/tree/master/samples/demos/azure-sql-edge-demos/iron-ore-silica-impurities/tar-files).