Playwright-performer Anna Deavere Smith and playwright Sarah Ruhl are returning to Berkeley Repertory Theatre — separately — the company proclaimed in separate announcements Friday. Last seen at the Rep in “Let Me Down Easy,” a theatrical investigation of health care in America created in her signature, recreated-interviews docudrama format, Smith will unveil her latest work in a special three-week engagement July 14 through August 1. Doing Time in Education, The California Chapter, directed by Leah C.