docs: update data_source_name in configuration file

[Neaj-Morshad-101]

Getting invalid URL error because of this. Found the solution in https://github.com/xo/dburl documentation.
The example database connection URL that can be handled by dburl.Parse and dburl.Open:
sqlserver://user:[email protected]/dbname

I think we need to provide dbname in data_source_name

[burningalchemist]

I'd say dbname would be more relevant than master for the example DSN, as the string also supports instance name, which might be confusing.

Overall, I'm going to deprecate and remove this file eventually in favour of a proper static documentation website I work on in my free time.

Still, happy to merge the PR if you think it's useful. 👍

[Neaj-Morshad-101]

Updated with dbname