toradex: MAINTAINERS: entries for new reST docs

Add entries for the newly created documentation files in reST
format.
Signed-off-by: Igor Opaniuk <igor.opaniuk@toradex.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

board/toradex/apalis-imx8/MAINTAINERS

@@ -6,4 +6,5 @@ F:	arch/arm/dts/fsl-imx8-apalis.dts
 F:	arch/arm/dts/fsl-imx8-apalis-u-boot.dtsi
 F:	board/toradex/apalis-imx8/
 F:	configs/apalis-imx8qm_defconfig
+F:	doc/board/toradex/apalix-imx8.rst
 F:	include/configs/apalis-imx8.h

board/toradex/colibri-imx8x/MAINTAINERS

@@ -6,4 +6,5 @@ F:	arch/arm/dts/fsl-imx8x-colibri.dts
 F:	arch/arm/dts/fsl-imx8x-colibri-u-boot.dtsi
 F:	board/toradex/colibri-imx8x/
 F:	configs/colibri-imx8qxp_defconfig
+F:	doc/board/toradex/colibri-imx8x.rst
 F:	include/configs/colibri-imx8x.h

board/toradex/colibri_imx7/MAINTAINERS

@@ -4,6 +4,7 @@ W:	http://developer.toradex.com/software/linux/linux-software
 W:	https://www.toradex.com/community
 S:	Maintained
 F:	board/toradex/colibri_imx7/
+F:	doc/board/toradex/colibri_imx7.rst
 F:	include/configs/colibri_imx7.h
 F:	configs/colibri_imx7_defconfig
 F:	configs/colibri_imx7_emmc_defconfig

board/toradex/verdin-imx8mm/MAINTAINERS

@@ -6,4 +6,5 @@ F:	arch/arm/dts/imx8mm-verdin.dts
 F:	arch/arm/dts/imx8mm-verdin-u-boot.dtsi
 F:	board/toradex/verdin-imx8mm/
 F:	configs/verdin-imx8mm_defconfig
+F:	doc/board/toradex/verdin-imx8mm.rst
 F:	include/configs/verdin-imx8mm.h