[DOCs][DXF] Made the docstring indentation coherent

Now is the same as other "any layer" docstrings

kibot/out_dxf.py

@@ -50,8 +50,7 @@ class DXFOptions(DrillMarks):
 
 @output_class
 class DXF(AnyLayer):
-    """
-    DXF (Drawing Exchange Format)
+    """ DXF (Drawing Exchange Format)
         Exports the PCB to 2D mechanical EDA tools (like AutoCAD).
         This output is what you get from the File/Plot menu in pcbnew. """
     __doc__ += FONT_HELP_TEXT