Fix PEP8 issues.
Fix a PEP8 issues in doc/source/conf.py to make the code pretty. Change-Id: I71d36ebb59d44ba145ca13e4f4827139f0466d78
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Fix a PEP8 issues in doc/source/conf.py to make the code pretty. Change-Id: I71d36ebb59d44ba145ca13e4f4827139f0466d78