dts: bindings: Remove 'title:' and put all info. into 'description:'

Add any useful information from 'title:' to the 'description:' strings
(e.g. explanations of acronyms), and remove 'title:' as well as any
copy-pasted "this binding gives a ..." boilerplate.

Also clean some description strings up a bit.

Some other things could probably be cleaned up (replacing 'GPIO node'
with 'GPIO controller' on controllers for consistency, for example), but
I kept things close to the original to avoid accidentally messing up.

Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>

dts/bindings/kscan/kscan.yaml

@@ -1,10 +1,7 @@
 # Copyright (c) 2019, Intel Corporation
 # SPDX-License-Identifier: Apache-2.0
 
-title: Keyboard Scan Matrix  Base Structure
-
-description: |
-    This binding gives the base structures for all Keyboard Matrix devices
+# Common properties for keyboard matrix devices
 
 include: base.yaml
 

dts/bindings/kscan/microchip,xec-kscan.yaml

@@ -1,10 +1,7 @@
 # Copyright (c) 2019, Intel Corporation
 # SPDX-License-Identifier: Apache-2.0
 
-title: Microchip XEC Keyboard Scan Matrix
-
-description: |
-    This is a representation of the Microchip XEC Keyboard Matrix controller
+description: Microchip XEC keyboard matrix controller
 
 compatible: "microchip,xec-kscan"
 
@@ -16,4 +13,3 @@ properties:
 
     interrupts:
       required: true
-...