fix typo

[doctorcolossus]

"will be have" → "will have"

Checklist

• I've ensured that similar functionality has not already been implemented
• [n/a] I've ensured that similar functionality has not earlier been proposed and declined
• I've branched off the master or python-dual-support branch
• I've merged fresh upstream into my branch recently
• [n/a] I've ran tox successfully in local environment
• [n/a] I've included docstrings and/or documentation and/or examples for my code (if this is a new feature)

Description:

(P. S. If this pull requests fixes an existing issue, please specify which one.)