Fix docspec errors due to upgrade

Author: harendra-kumar

core/src/doctest/DocTestDataStreamK.hs

@@ -1,6 +1,7 @@
 {- $setup
 
 >>> :m
+>>> :set -XFlexibleContexts
 >>> import Control.Concurrent (threadDelay)
 >>> import Data.Function (fix, (&))
 >>> import Data.Semigroup (cycle1)

core/src/doctest/DocTestFileSystemWindowsPath.hs

@@ -1,6 +1,7 @@
 {- $setup
 >>> :m
 >>> :set -XQuasiQuotes
+>>> :set -XScopedTypeVariables
 >>> import Control.Exception (SomeException, evaluate, try)
 >>> import Data.Either (Either, isLeft)
 >>> import Data.Maybe (fromJust, isNothing, isJust)