promote markdown generator tests

Signed-off-by: lubegasimon <lubegasimon73@gmail.com>

Author: lubegasimon

test/generators/markdown/Alias.X.md

@@ -0,0 +1,7 @@
+AliasX
+
+Module  `` Alias.X `` 
+
+###### type t = int
+
+Module Foo__X documentation. This should appear in the documentation for the alias to this module 'X'

test/generators/markdown/Alias.md

@@ -0,0 +1,12 @@
+Alias
+
+Module  `` Alias `` 
+
+###### module X : sig
+
+######     type t = int
+
+Module Foo__X documentation. This should appear in the documentation for the alias to this module 'X'
+
+###### end
+

test/generators/markdown/Bugs.md

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+Bugs
+
+Module  `` Bugs `` 
+
+###### type 'a opt = 'a option
+
+###### val foo : ?bar:'a -> unit -> unit
+
+Triggers an assertion failure when https://github.com/ocaml/odoc/issues/101 is not fixed.

test/generators/markdown/Bugs_post_406.let_open'.md

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+Bugs_post_406let_open'
+
+Class  `` Bugs_post_406.let_open' `` 
+

test/generators/markdown/Bugs_post_406.md

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+Bugs_post_406
+
+Module  `` Bugs_post_406 `` 
+
+Let-open in class types, https://github.com/ocaml/odoc/issues/543 This was added to the language in 4.06
+###### class type  let_open = object
+###### end
+
+###### class  let_open' : object
+###### end
+

test/generators/markdown/Class.empty_virtual'.md

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+Classempty_virtual'
+
+Class  `` Class.empty_virtual' `` 
+

test/generators/markdown/Class.md

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+Class
+
+Module  `` Class `` 
+
+###### class type  empty = object
+###### end
+
+###### class type  mutually = object
+###### end
+
+###### class type  recursive = object
+###### end
+
+###### class  mutually' : object
+###### end
+
+###### class  recursive' : object
+###### end
+
+###### class type virtual  empty_virtual = object
+###### end
+
+###### class virtual  empty_virtual' : object
+###### end
+
+###### class type 'a polymorphic = object
+###### end
+
+###### class 'a polymorphic' : object
+###### end
+

test/generators/markdown/Class.mutually'.md

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+Classmutually'
+
+Class  `` Class.mutually' `` 
+

test/generators/markdown/Class.polymorphic'.md

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+Classpolymorphic'
+
+Class  `` Class.polymorphic' `` 
+

test/generators/markdown/Class.recursive'.md

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+Classrecursive'
+
+Class  `` Class.recursive' `` 
+