Man page whitespace/formatting change to appease igor(1)

igor is a tool to detect common problems and style conformance issues in
man pages and other documents.  This is a non-content change to address
the items it reported, before making content changes.

See http://www.wonkity.com/~wblock/igor/igor.1.html for more information
about igor(1).

llvm-svn: 255769