make help: add tools help target
Add a top-level Makefile help target for Userspace tools. Also make each help "heading" end with a colon ':'. Link: http://lkml.kernel.org/r/55c986ff-3966-3e47-2984-7349da2cce51@infradead.orgSigned-off-by: NRandy Dunlap <rdunlap@infradead.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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