Document optional kwargs for external calls

[benber86]

What I did

Added a description of the different kwargs that can be passed with an external call to the Interfaces/Declaring and using Interfaces section of the docs.

How I did it

Edited docs/interfaces.rst

Commit message

Document optional kwargs for external calls

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[codecov-commenter]

Codecov Report

Merging #3122 (b685175) into master (f4deb13) will not change coverage.
The diff coverage is n/a.

❗ Current head b685175 differs from pull request most recent head 52c42f1. Consider uploading reports for the commit 52c42f1 to get more accurate results

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  Lines       10759    10759           
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  Hits         9521     9521           
  Misses        796      796           
  Partials      442      442           

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