pinctrl: generic: update references to Documentation/pinctrl.txt

Update deprecated references to Documentation/pinctrl.txt since it has been
moved to Documentation/driver-api/pinctl.rst.

Signed-off-by: Ludovic Desroches <[email protected]>
Fixes: 5a9b73832e9e ("pinctrl.txt: move it to the driver-api book")
Signed-off-by: Linus Walleij <[email protected]>
diff --git a/MAINTAINERS b/MAINTAINERS
index f66488d..2c85558 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -10375,7 +10375,7 @@
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl.git
 S:	Maintained
 F:	Documentation/devicetree/bindings/pinctrl/
-F:	Documentation/pinctrl.txt
+F:	Documentation/driver-api/pinctl.rst
 F:	drivers/pinctrl/
 F:	include/linux/pinctrl/