By John Revill ZURICH (Reuters) -Siemens' shares fell almost 6% on Thursday as a hike in its medium-term sales growth forecast failed to allay investors amid profit-taking and disappointment ​about next year's profit outlook. The company, which on Wednesday said it plans to eventually cut its stake ‌in Siemens Healthineers to 20%, said it expects its sales to rise by 6-8% next year and 6-9% in the ‌mid term. Both figures would mark an acceleration from the 5% revenue growth rate Siemens reported on Thur ...