Documentation: dt: display: fix spelling mistake

Signed-off-by: NEric Engestrom <eric@engestrom.ch>
Signed-off-by: NRob Herring <robh@kernel.org>

Documentation/devicetree/bindings/display/exynos/exynos_dsim.txt

@@ -41,7 +41,7 @@ Video interfaces:
   endpoint node connected from mic node (reg = 0):
     - remote-endpoint: specifies the endpoint in mic node. This node is required
 		       for Exynos5433 mipi dsi. So mic can access to panel node
-		       thoughout this dsi node.
+		       throughout this dsi node.
   endpoint node connected to panel node (reg = 1):
     - remote-endpoint: specifies the endpoint in panel node. This node is
 		       required in all kinds of exynos mipi dsi to represent