Document united (#134)

Author: Neppord

CHANGELOG.md

@@ -11,6 +11,7 @@ New features:
 Bugfixes:
 
 Other improvements:
+  - Improve documentation for `united` (#134 by @neppord)
 
 ## [v7.0.1](https://github.com/purescript-contrib/purescript-profunctor-lenses/releases/tag/v7.0.1) - 2021-05-06
 

src/Data/Lens/Lens/Unit.purs

@@ -5,5 +5,11 @@ import Prelude
 import Data.Lens.Lens (Lens', lens)
 
 -- | There is a `Unit` in everything.
+-- | ```purescript
+-- | > view united [1,2,3]
+-- | unit
+-- | > over united (\a -> a :: Unit) [1,2,3]
+-- | [1 2 3]
+-- | ```
 united :: forall a. Lens' a Unit
 united = lens (const unit) const