dt-bindings: Fix typo on the DesignWare IP reset bindings documentation

This patch removes a loose "i" character is present on the current
documentation.
Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Link: https://lore.kernel.org/r/89719d8d40048e9b7baa0cd984b5bb108d056de4.1605741519.git.gustavo.pimentel@synopsys.comSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/reset/snps,dw-reset.txt

@@ -23,7 +23,7 @@ example:
 		#reset-cells = <1>;
 	};
 
-	dw_rst_2: reset-controller@1000 {i
+	dw_rst_2: reset-controller@1000 {
 		compatible = "snps,dw-low-reset";
 		reg = <0x1000 0x8>;
 		#reset-cells = <1>;