Fix typo in the doc text
Fix typo in the doc text

dashea/libblockdev,vpodzime/libblockdev,vpodzime/libblockdev,dashea/libblockdev,snbueno/libblockdev,rhinstaller/libblockdev,atodorov/libblockdev,rhinstaller/libblockdev,atodorov/libblockdev,rhinstaller/libblockdev,snbueno/libblockdev,vpodzime/libblockdev,atodorov/libblockdev