Merge pull request #854 from dnellis-wrs/patch-1

Update README.md

linux/preview/examples/mssql-customize/README.md

@@ -24,7 +24,7 @@ docker build -t mssql-custom .
 
 Then spin up a new container using `docker run`
 ```
-docker run -e 'ACCEPT_EULA=Y' -e 'SA_PASSWORD=StrongPassw0rd' -p 1433:1433 --name sql1 -d mssql-custom
+docker run -e 'ACCEPT_EULA=Y' -e 'MSSQL_SA_PASSWORD=StrongPassw0rd' -p 1433:1433 --name sql1 -d mssql-custom
 ```
 
 Note: MSSQL passwords must be at least 8 characters long, contain upper case, lower case and digits.