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>
diff --git a/board/toradex/colibri_imx7/MAINTAINERS b/board/toradex/colibri_imx7/MAINTAINERS
index 178dece..82246be 100644
--- a/board/toradex/colibri_imx7/MAINTAINERS
+++ b/board/toradex/colibri_imx7/MAINTAINERS
@@ -4,6 +4,7 @@
 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