Fix deleteFindMin Haddock example (#710)

deleteFindMin was missing the map argument (`empty`).

Author: zliu41

.gitignore

@@ -7,6 +7,7 @@
 *.tix
 .hpc/
 /dist/*
+/dist-newstyle/*
 GNUmakefile
 dist-install
 ghc.mk

containers/src/Data/Map/Internal.hs

@@ -3949,7 +3949,7 @@ maxViewSure = go
 -- | /O(log n)/. Delete and find the minimal element.
 --
 -- > deleteFindMin (fromList [(5,"a"), (3,"b"), (10,"c")]) == ((3,"b"), fromList[(5,"a"), (10,"c")])
--- > deleteFindMin                                            Error: can not return the minimal element of an empty map
+-- > deleteFindMin empty                                      Error: can not return the minimal element of an empty map
 
 deleteFindMin :: Map k a -> ((k,a),Map k a)
 deleteFindMin t = case minViewWithKey t of