[Fix] typo docstring eda process

[danibene]

Description

This PR fixes a typo in the eda_process() docstring mentioned in #851

Checklist

Here are some things to check before creating the PR. If you encounter any issues, do let us know :)

• I have read the CONTRIBUTING file.
• My PR is targeted at the dev branch (and not towards the master branch).

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (2bc31bb) 54.14% compared to head (fdd7f34) 54.15%.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #852   +/-   ##
=======================================
  Coverage   54.14%   54.15%           
=======================================
  Files         295      295           
  Lines       13818    13818           
=======================================
+ Hits         7482     7483    +1     
+ Misses       6336     6335    -1     

Impacted Files	Coverage Δ
neurokit2/eda/eda_process.py	92.00% <ø> (ø)

... and 2 files with indirect coverage changes

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