Fix docstring for XRootD DID finder

[ponyisi]

Fix #570

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.03%. Comparing base (37076b0) to head (dfbda4f).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #581   +/-   ##
=======================================
  Coverage   96.03%   96.03%           
=======================================
  Files          28       28           
  Lines        1816     1816           
=======================================
  Hits         1744     1744           
  Misses         72       72           

Flag	Coverage Δ
unittests	96.03% <ø> (ø)

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[gordonwatts]

I hate when I discover these cut/paste codes. :-)