DOC: fix EnsureCallable docstring

[matrss]

Just a small fix for a copy-paste mistake.

[codecov]

Codecov Report

Base: 88.51% // Head: 88.51% // No change to project coverage 👍

Coverage data is based on head (98fb5ae) compared to base (98fb5ae).
Patch has no changes to coverable lines.

❗ Current head 98fb5ae differs from pull request most recent head 97e818d. Consider uploading reports for the commit 97e818d to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##            maint    #7245   +/-   ##
=======================================
  Coverage   88.51%   88.51%           
=======================================
  Files         326      326           
  Lines       44420    44420           
  Branches     5919     5919           
=======================================
  Hits        39318    39318           
  Misses       5087     5087           
  Partials       15       15           

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.

[yarikoptic]

Looks good to me but I think it better goes against maint branch.

[qlty-cloud-legacy]

Code Climate has analyzed commit e5eded7 and detected 0 issues on this pull request.

View more on Code Climate.

[matrss]

Makes sense. I changed the target branch to maint and rebased onto it.

[yarikoptic]

Great, thank you!

[yarikoptic-gitmate]

PR released in 0.18.1