Update evolve.py

[CatalinaAlbornoz]

Added docs clarification about positional arg.

I didn't do any of the checks below.

Before submitting

Please complete the following checklist when submitting a PR:

• All new features must include a unit test.
  If you've fixed a bug or added code that should be tested, add a test to the
  test directory!

• All new functions and code must be clearly commented and documented.
  If you do make documentation changes, make sure that the docs build and
  render correctly by running make docs.

• Ensure that the test suite passes, by running make test.

• Add a new entry to the doc/releases/changelog-dev.md file, summarizing the
  change, and including a link back to the PR.

• The PennyLane source code conforms to
  PEP8 standards.
  We check all of our code against Pylint.
  To lint modified files, simply pip install pylint, and then
  run pylint pennylane/path/to/file.py.

When all the above are checked, delete everything above the dashed
line and fill in the pull request template.

---

[github-actions]

Hello. You may have forgotten to update the changelog!
Please edit doc/releases/changelog-dev.md with:

• A one-to-two sentence description of the change. You may include a small working example for new features.
• A link back to this PR.
• Your name (or GitHub username) in the contributors section.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.60%. Comparing base (a0f6f71) to head (0b18445).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #7016   +/-   ##
=======================================
  Coverage   99.60%   99.60%           
=======================================
  Files         485      485           
  Lines       46361    46361           
=======================================
  Hits        46178    46178           
  Misses        183      183           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[andrijapau]

Seems like the render didn't go well 😢 , maybe *positional* works?

[CatalinaAlbornoz]

Good catch @andrijapau !

[andrijapau]

Nice! 🥳 Looks like it worked.

[andrijapau]

Just one blocking suggestion!

[andrijapau]

Looks great! Thanks for your help 🚀