Update Haddock submodule for collapsible section support

This also updates a few occurences of recently added "Example"
headings to make use of this new feature for testing

libraries/base/Data/Bool.hs

@@ -37,7 +37,7 @@ import GHC.Base
 --
 --   /Since: 4.7.0.0/
 --
---   __Examples__:
+--   ==== __Examples__
 --
 --   Basic usage:
 --

libraries/base/Data/Functor.hs

@@ -33,7 +33,7 @@ infixl 4 <$>
 
 -- | An infix synonym for 'fmap'.
 --
---   __Examples__:
+--   ==== __Examples__
 --
 --   Convert from a 'Maybe' 'Int' to a 'Maybe' 'String' using 'show':
 --
@@ -70,7 +70,7 @@ infixl 4 $>
 --
 --   /Since: 4.7.0.0/
 --
---   __Examples__:
+--   ==== __Examples__
 --
 --   Replace the contents of a 'Maybe' 'Int' with a constant 'String':
 --
@@ -103,7 +103,7 @@ infixl 4 $>
 -- | @'void' value@ discards or ignores the result of evaluation, such
 --   as the return value of an 'IO' action.
 --
---   __Examples__:
+--   ==== __Examples__
 --
 --   Replace the contents of a 'Maybe' 'Int' with unit:
 --

libraries/base/Text/Printf.hs

@@ -246,7 +246,7 @@ import System.IO
 -- * Haskell 'printf' will place a zero after a decimal point when
 --   possible.
 --
--- Examples:
+-- ==== __Examples__
 --
 -- >   > printf "%d\n" (23::Int)
 -- >   23

haddock @ 3fb325a2

-Subproject commit c3f27a96bd2a1ec14f441c72a2df95c16c2c5408
+Subproject commit 3fb325a2ca6b6397905116024922d079447a2e08