spi: dt-bindings: Fix description mentioning a removed property

'spi-cpha' was removed from this file. So, replace it in the description
with an existing example. Reformat the paragraph to adhere to max line
length.

Fixes: 233363a ("spi/panel: dt-bindings: drop CPHA and CPOL from common properties")
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://patch.msgid.link/20250417111630.53084-2-wsa+renesas@sang-engineering.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: Wolfram Sang

Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml

@@ -8,12 +8,13 @@ title: Peripheral-specific properties for a SPI bus.
 
 description:
   Many SPI controllers need to add properties to peripheral devices. They could
-  be common properties like spi-max-frequency, spi-cpha, etc. or they could be
-  controller specific like delay in clock or data lines, etc. These properties
-  need to be defined in the peripheral node because they are per-peripheral and
-  there can be multiple peripherals attached to a controller. All those
-  properties are listed here. The controller specific properties should go in
-  their own separate schema that should be referenced from here.
+  be common properties like spi-max-frequency, spi-cs-high, etc. or they could
+  be controller specific like delay in clock or data lines, etc. These
+  properties need to be defined in the peripheral node because they are
+  per-peripheral and there can be multiple peripherals attached to a
+  controller. All those properties are listed here. The controller specific
+  properties should go in their own separate schema that should be referenced
+  from here.
 
 maintainers:
   - Mark Brown <broonie@kernel.org>