Fix example for scrape named capturing group regex

[rakuy0]

No description provided.

[codecov]

Codecov Report

Merging #2606 (7830b08) into master (ef79c46) will decrease coverage by 0.12%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2606      +/-   ##
==========================================
- Coverage   96.91%   96.79%   -0.13%     
==========================================
  Files         200      200              
  Lines       38262    38262              
==========================================
- Hits        37081    37034      -47     
- Misses       1181     1228      +47     

Flag	Coverage Δ
linux	96.79% <ø> (-0.01%)	⬇️
linux_replay	?

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Impacted Files	Coverage Δ
synapse/lib/stormlib/scrape.py	98.41% <ø> (ø)
synapse/tests/utils.py	94.21% <0.00%> (-1.98%)	⬇️
synapse/lib/hiveauth.py	96.30% <0.00%> (-0.71%)	⬇️
synapse/cortex.py	96.51% <0.00%> (-0.63%)	⬇️
synapse/lib/view.py	95.30% <0.00%> (-0.51%)	⬇️
synapse/lib/trigger.py	94.98% <0.00%> (-0.39%)	⬇️
synapse/lib/jsonstor.py	98.29% <0.00%> (-0.25%)	⬇️
synapse/lib/lmdbslab.py	99.52% <0.00%> (-0.20%)	⬇️
synapse/lib/layer.py	96.97% <0.00%> (-0.13%)	⬇️
synapse/lib/hive.py	98.31% <0.00%> (+0.24%)	⬆️

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