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This is a mechanically generated patch to switch the documentation jobs to use the new PTI versions of the jobs as part of the python3-first goal. See the python3-first goal document for details: https://governance.openstack.org/tc/goals/stein/python3-first.html Fix doc8 failures. Move doc8 to pep8 environment following PTI. Change-Id: I5e236be20940ae6840eff804804b99f42cd6fcb2 Story: #2002586 Task: #24319