Update config.rst

[funkyfuture]

i'm emphasizing two aspects here that took me a while to figure out.

[codecov-io]

Codecov Report

Merging #209 into master will not impact coverage.

@@           Coverage Diff           @@
##           master     #209   +/-   ##
=======================================
  Coverage   67.78%   67.78%           
=======================================
  Files          15       15           
  Lines         835      835           
  Branches       91       91           
=======================================
  Hits          566      566           
  Misses        239      239           
  Partials       30       30

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 0e8b1df...7cdf06c. Read the comment docs.

[Digenis]

Hi @funkyfuture, welcome to scrapyd. Thank you for tiding up the documentation. We will merge this but I want to check some things first (see my comment on the code)