[mipi_rgb] Clarify use of transform (#5649)

Author: clydebarrow

content/components/display/mipi_rgb.md

@@ -134,9 +134,11 @@ Displays needing a custom init sequence require an SPI bus to be configured, plu
   `16bit` (default) or `18bit`.
 - **invert_colors** (*Optional*): Inverts the display colors, (white becomes black.) Defaults to false.
 - **color_order** (*Optional*): Should be one of `bgr` (default) or `rgb`.
-- **transform** (*Optional*): Transform the display presentation using hardware. All defaults are `false`.
-  This option should not be used with `rotation`. For the `CUSTOM` model, use `transform: disabled`
-  if the display does not support it, which will prevent a `rotation` being translated to a hardware transform.
+- **transform** (*Optional*): Transform the display presentation using hardware.
+  This is typically used only to correct for displays that have x or y drivers wired backwards. To rotate the
+  display the `rotation` option is preferred - it will automatically use hardware transform if possible.
+  The default values for the `mirror_x` and `mirror_y` options are model dependent.
+  For the `CUSTOM` model, use of `transform: disabled` will prevent a `rotation` being translated to a hardware transform.
 
   - **mirror_x** (*Optional*, boolean): If true, mirror the x-axis.
   - **mirror_y** (*Optional*, boolean): If true, mirror the y-axis.