Correct function reference in 'using' page

[Dresdn]

• Fix a typo in the reference to create_public_tenant function, updating it to tasks.create_public_tenant.

Pull Request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

Related issue(s)

Refs #529 call out - thank you @adnannazir

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (05467ad) 88.58% compared to head (04a9f44) 88.58%.
Report is 5 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #532   +/-   ##
=======================================
  Coverage   88.58%   88.58%           
=======================================
  Files          18       18           
  Lines         631      631           
  Branches      117      117           
=======================================
  Hits          559      559           
  Misses         64       64           
  Partials        8        8           

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