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Fix code example of LeftOuterJoin and ?.

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Ping Chen 2019-09-07 08:56:57 +09:00 committed by GitHub
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@ -157,8 +157,8 @@ However, you may want your results to include people who don't have any blog pos
```haskell
select $
from $ \(p `LeftOuterJoin`` mb) -> do
on (p ^. PersonId ==. mb ?. BlogPostAuthorId)
from $ \(p `LeftOuterJoin` mb) -> do
on (just (p ^. PersonId) ==. mb ?. BlogPostAuthorId)
orderBy [asc (p ^. PersonName), asc (mb ?. BlogPostTitle)]
return (p, mb)
```