dt-bindings: dmaengine: xilinx_dma: Fix formatting and style

Trivial formatting(keep compatible string one per line, caps change etc).
It doesn't modify the content of the binding.

Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/1571763622-29281-3-git-send-email-radhey.shyam.pandey@xilinx.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/dma/xilinx/xilinx_dma.txt

@@ -12,8 +12,10 @@ Xilinx AXI CDMA engine, it does transfers between memory-mapped source
 address and a memory-mapped destination address.
 
 Required properties:
-- compatible: Should be "xlnx,axi-vdma-1.00.a" or "xlnx,axi-dma-1.00.a" or
-	      "xlnx,axi-cdma-1.00.a""
+- compatible: Should be one of-
+		"xlnx,axi-vdma-1.00.a"
+		"xlnx,axi-dma-1.00.a"
+		"xlnx,axi-cdma-1.00.a"
 - #dma-cells: Should be <1>, see "dmas" property below
 - reg: Should contain VDMA registers location and length.
 - xlnx,addrwidth: Should be the vdma addressing size in bits(ex: 32 bits).
@@ -29,7 +31,7 @@ Required properties:
 			   "m_axis_mm2s_aclk", "s_axis_s2mm_aclk"
 	For CDMA:
 	Required elements: "s_axi_lite_aclk", "m_axi_aclk"
-	FOR AXIDMA:
+	For AXIDMA:
 	Required elements: "s_axi_lite_aclk"
 	Optional elements: "m_axi_mm2s_aclk", "m_axi_s2mm_aclk",
 			   "m_axi_sg_aclk"