Update README

Author: alinaliBQ

cpp/src/arrow/flight/sql/odbc/README

@@ -22,25 +22,26 @@
 After the build succeeds, the ODBC DLL will be located in 
 `build\debug\Debug` for a debug build and `build\release\Release` for a release build.
 
-1. Open Power Shell as administrator.
+1. Open Windows Power Shell as administrator.
 
 2. Register your ODBC DLL:
     Need to replace <path\to\repo> with actual path to repository in the commands.
 
     i. `cd to repo.`
     ii. `cd <path\to\repo>`
     iii. Run script to register your ODBC DLL as Apache Arrow Flight SQL ODBC Driver
-    `.\cpp\src\arrow\flight\sql\odbc\install\install_odbc.cmd <path\to\repo>\cpp\build\< release | debug >\< Release | Debug>\arrow_flight_sql_odbc.dll`
+    `.\cpp\src\arrow\flight\sql\odbc\tests\install_odbc.cmd <path\to\repo>\cpp\build\< release | debug >\< Release | Debug>\arrow_flight_sql_odbc.dll`
     Example command for reference:
-    `.\cpp\src\arrow\flight\sql\odbc\install\install_odbc.cmd C:\path\to\arrow\cpp\build\release\Release\arrow_flight_sql_odbc.dll`
+    `.\cpp\src\arrow\flight\sql\odbc\tests\install_odbc.cmd C:\path\to\arrow\cpp\build\release\Release\arrow_flight_sql_odbc.dll`
 
 If the registration is successful, then Apache Arrow Flight SQL ODBC Driver 
 should show as an available ODBC driver in the x64 ODBC Driver Manager.
 
 ## Steps to Generate Windows Installer
-1. Build with  `ARROW_FLIGHT_SQL_ODBC=ON` and `ARROW_FLIGHT_SQL_ODBC_INSTALLER=ON`.
-2. `cd` to `build` folder.
-3. Run `cpack`. 
+1. Install WiX toolset v6 from [GitHub](https://github.com/wixtoolset/wix/releases/).
+2. Build with  `ARROW_FLIGHT_SQL_ODBC=ON` and `ARROW_FLIGHT_SQL_ODBC_INSTALLER=ON`.
+3. `cd` to `build` folder.
+4. Run `cpack`. 
 
 If the generation is successful, you will find `Apache Arrow Flight SQL ODBC-<version>-win64.msi` generated under the `build` folder.