fix typos and reword (#828)

Typo and reword

Author: askeblad

containers/docs/sequence.rst

@@ -12,7 +12,7 @@ defines the ``Seq`` data type.
 Short Example
 -------------
 
-The following GHCi session shows some of the basic sequence funcitonality::
+The following GHCi session shows some of the basic sequence functionality::
 
     -- Import the Seq type and operators for combining sequences unqualified.
     -- Import the rest of the Sequence module qualified.

containers/src/Data/Sequence/Internal.hs

@@ -3360,8 +3360,8 @@ fromArray :: Ix i => Array i a -> Seq a
 #ifdef __GLASGOW_HASKELL__
 fromArray a = fromFunction (GHC.Arr.numElements a) (GHC.Arr.unsafeAt a)
  where
-  -- The following definition uses (Ix i) constraing, which is needed for the
-  -- other fromArray definition.
+  -- The following definition uses an (Ix i) constraint, which is needed for
+  -- the other fromArray definition.
   _ = Data.Array.rangeSize (Data.Array.bounds a)
 #else
 fromArray a = fromList2 (Data.Array.rangeSize (Data.Array.bounds a)) (Data.Array.elems a)

containers/src/Data/Set/Internal.hs

@@ -1632,14 +1632,14 @@ maxView (Bin _ x l r) = Just $! toPair $ maxViewSure x l r
   [ratio] is the ratio between an outer and inner sibling of the
           heavier subtree in an unbalanced setting. It determines
           whether a double or single rotation should be performed
-          to restore balance. It is correspondes with the inverse
+          to restore balance. It is corresponds with the inverse
           of $\alpha$ in Adam's article.
 
   Note that according to the Adam's paper:
   - [delta] should be larger than 4.646 with a [ratio] of 2.
   - [delta] should be larger than 3.745 with a [ratio] of 1.534.
 
-  But the Adam's paper is errorneous:
+  But the Adam's paper is erroneous:
   - it can be proved that for delta=2 and delta>=5 there does
     not exist any ratio that would work
   - delta=4.5 and ratio=2 does not work