[ccan] [patches] Minor ccanlint changes

[Brad Hards]

0002 is worth looking at first.  It protects the new examples_relevant test 
against a function description that doesn't actually have the proper format 
summary line (e.g. is missing the "my_foo -" part).

The other two I'm not so sure about. The layout looks a bit strange without 
them, but perhaps there is a cleaner way to handle this (like always appending 
the newline if not already present)

Brad
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