dt-bindings: display: st,stm32-dsi: Fix white spaces

Remove unneeded indentation in blank line and space at end of line.

Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: Rob Herring <[e-mail]>

Documentation/devicetree/bindings/display/st,stm32-dsi.yaml

···
         resets = <&rcc DSI_R>;
         reset-names = "apb";
         phy-dsi-supply = <&reg18>;
-        
+
         #address-cells = <1>;
         #size-cells = <0>;
 

Documentation/devicetree/bindings/display/st,stm32-ltdc.yaml

···
   port:
     type: object
     description:
-      "Video port for DPI RGB output. 
+      "Video port for DPI RGB output.
       ltdc has one video port with up to 2 endpoints:
       - for external dpi rgb panel or bridge, using gpios.
       - for internal dpi input of the MIPI DSI host controller.