Documentation changes from ghc-internal restructuring

Previously many declarations (e.g. `Int`) were declared to have a "home"
in `Prelude`. However, now Haddock instead chooses to put these in
more specific homes (e.g. `Data.Int`). Given that the "home" decision is
driven by heuristics and in general these changes seem
quite reasonable I am accepting them:

 * `Int` moved from `Prelude` to `Data.Int`
 * `(~)` moved from `Prelude` to `Data.Type.Equality`
 * `Type` moved from `GHC.Types` to `Data.Kind`
 * `Maybe` moved from `Prelude` to `Data.Maybe`
 * `Bool` moved from `Prelude` to `Data.Bool`
 * `Ordering` moved from `Prelude` to `Data.Ord`

As well, more identifiers are now hyperlinked; it's not immediately
clear *why*, but it is an improvement nevertheless.

Author: bgamari

html-test/ref/A.html

@@ -64,13 +64,13 @@
 	    ><li class="src short"
 	    ><a href="#"
 	      >other</a
-	      > :: <a href="#" title="Prelude"
+	      > :: <a href="#" title="Data.Int"
 	      >Int</a
 	      ></li
 	    ><li class="src short"
 	    ><a href="#"
 	      >test2</a
-	      > :: <a href="#" title="Prelude"
+	      > :: <a href="#" title="Data.Bool"
 	      >Bool</a
 	      ></li
 	    ><li class="src short"
@@ -84,7 +84,7 @@
 	    ><li class="src short"
 	    ><a href="#"
 	      >reExport</a
-	      > :: <a href="#" title="Prelude"
+	      > :: <a href="#" title="Data.Int"
 	      >Int</a
 	      ></li
 	    ></ul
@@ -121,7 +121,7 @@
 	><p class="src"
 	  ><a id="v:other" class="def"
 	    >other</a
-	    > :: <a href="#" title="Prelude"
+	    > :: <a href="#" title="Data.Int"
 	    >Int</a
 	    > <a href="#" class="selflink"
 	    >#</a
@@ -131,7 +131,7 @@
 	><p class="src"
 	  ><a id="v:test2" class="def"
 	    >test2</a
-	    > :: <a href="#" title="Prelude"
+	    > :: <a href="#" title="Data.Bool"
 	    >Bool</a
 	    > <a href="#" class="selflink"
 	    >#</a
@@ -175,7 +175,7 @@
 	><p class="src"
 	  ><a id="v:reExport" class="def"
 	    >reExport</a
-	    > :: <a href="#" title="Prelude"
+	    > :: <a href="#" title="Data.Int"
 	    >Int</a
 	    > <a href="#" class="selflink"
 	    >#</a