edited typo, per sql-docs issue #4347

fixes https://github.com/MicrosoftDocs/sql-docs/issues/4347

Author: WilliamAntonRohm

samples/features/sql-big-data-cluster/bootstrap-sample-db.cmd

@@ -23,7 +23,7 @@ set KNOX_ENDPOINT=%KNOX_ENDPOINT%:%KNOX_PORT%
 set SQLCMDSERVER=%SQL_MASTER_INSTANCE%
 if DEFINED AZDATA_USERNAME set SQLCMDUSER=%AZDATA_USERNAME%
 if DEFINED AZDATA_PASSWORD set SQLCMDPASSWORD=%AZDATA_PASSWORD%
-if DEFINED AZDATA_PASSWORD set set KNOX_PASSWORD=%AZDATA_PASSWORD%
+if DEFINED AZDATA_PASSWORD set KNOX_PASSWORD=%AZDATA_PASSWORD%
 
 if NOT DEFINED SQLCMDUSER (
     set BCP_CREDENTIALS=-T