fix haddock markup

Haddock dislikes lines with '{- #///' and has special treatment for it.

> Haddock coverage:
>    0% (  0 /  1) in 'Bindings.Libgit2.Windows'
>    0% (  0 /  1) in 'Bindings.Libgit2.Version'
>    0% (  0 / 17) in 'Bindings.Libgit2.Common'
>    0% (  0 / 50) in 'Bindings.Libgit2.Errors'
>    0% (  0 /  3) in 'Bindings.Libgit2.Message'
>    0% (  0 /  8) in 'Bindings.Libgit2.Strarray'
>    0% (  0 /  5) in 'Bindings.Libgit2.Threads'
>
> Bindings/Libgit2/Types.hsc:39:1: parse error on input `{'

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
Bump hlibgit2 to 0.18.0.10
Merge commit '4973c22'
Export currentTreeOid from Git.Tree.Builder
Improve the efficiency of git-monitor, ignore symlinks
Improve Show instance for ObjectInfo
Treat all Tree paths as opaque ByteStrings, per Git's man page
Throw an exception if copying a object doesn't work
Simplify Cabal package dependencies
Enable debug code in gitlib-libgit2
Merge remote-tracking branch 'origin/staging' into staging