added game element descriptions for even more BD style game elements

diff --git a/docs/elements/bdx_wall_non_sloped.txt b/docs/elements/bdx_wall_non_sloped.txt
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+This is a non-sloped variant of normal wall.
+
+Unlike normal walls, objects
+that can fall will not slip off this wall to the left or to the right.

diff --git a/docs/elements/bdx_wall_sloped_down_left.txt b/docs/elements/bdx_wall_sloped_down_left.txt
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+Acts like ordinary wall, but is sloped on the lower left corner.
+
+Elements like flying rocks or diamonds will roll off to the left.

diff --git a/docs/elements/bdx_wall_sloped_down_right.txt b/docs/elements/bdx_wall_sloped_down_right.txt
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+Acts like ordinary wall, but is sloped on the lower right corner.
+
+Elements like flying rocks or diamonds will roll off to the right.

diff --git a/docs/elements/bdx_wall_sloped_up_left.txt b/docs/elements/bdx_wall_sloped_up_left.txt
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+++ b/docs/elements/bdx_wall_sloped_up_left.txt
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+Acts like ordinary wall, but is sloped on the upper left corner.
+
+Elements like rocks or diamonds will roll off to the left.

diff --git a/docs/elements/bdx_wall_sloped_up_right.txt b/docs/elements/bdx_wall_sloped_up_right.txt
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+++ b/docs/elements/bdx_wall_sloped_up_right.txt
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+Acts like ordinary wall, but is sloped on the upper right corner.
+
+Elements like rocks or diamonds will roll off to the right.