Update mssql ADO connection strings to the Documentation.

Hello,

currently I am trying to read data from an mssql database via Benthos.
The database is secured with a password that contains special characters like "!" and "#"

I was unable to establish a connection to the database using the dsn provided in the documentation since the password was interpreted as the port.
I got it working by having a look at the sources of Benthos and seeing that it uses go-mssqldb. Which in its documentation provided an ADO connection string that worked for me.

Since this is usefull to know, but not documented in the Benthos documentation I am starting this issue in hope the documentation gets updated with a link to the ADO connection strings of the go-mssqldb project.

Start with the SQL select DSN documentation at docs/components/inputs/sql_select/ and compare its MSSQL connection-string guidance with the go-mssqldb ADO connection-string documentation linked in the issue. Update the Benthos documentation to mention or link to the ADO format, then verify that the documented guidance covers passwords containing special characters.