Update user guide

[kaklakariada]

We should update the user guide as following:

• Mention to create a subfolder like "default/drivers/jdbc/databricks/" to upload the driver files. This approach allows having several JDBC drivers without conflicts.
• Add a note note that since 8.0.3 “JAR” and “DRIVERMAIN” entries aren’t necessary in settings.cfg. You’ll still need to keep the “NOSECURITY=YES” entry, as it rewrites the default.
• CONNECTION_NAME is missing in the CREATE VS statement
• Deactivate parameters in DbVis when creating the VS
• settings.cfg must use Unix line feeds LF, not windows CRLF