Documentation/devicetree: make semantic of initrd-end more explicit

	};

The bootargs property contains the kernel arguments, and the initrd-*

properties define the address and size of an initrd blob.  The

chosen node may also optionally contain an arbitrary number of

additional properties for platform-specific configuration data.

properties define the address and size of an initrd blob.  Note that

initrd-end is the first address after the initrd image, so this doesn't

match the usual semantic of struct resource.  The chosen node may also

optionally contain an arbitrary number of additional properties for

platform-specific configuration data.

During early boot, the architecture setup code calls of_scan_flat_dt()

several times with different helper callbacks to parse device tree