Fix small error in README.rst

[edwelker]

There was a typo in the README where the example to find a dashboards by data source name was trying to match against the "type" field, not the "name" field.

[amotl]

Thank you very much. We appreciate your attention to detail, and for taking the time to submit a fix.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.01%. Comparing base (8c82149) to head (f8527f1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #176   +/-   ##
=======================================
  Coverage   85.01%   85.01%           
=======================================
  Files           9        9           
  Lines        1121     1121           
=======================================
  Hits          953      953           
  Misses        168      168           

Flag	Coverage Δ
unittests	85.01% <ø> (ø)

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[amotl]

Thanks!