doc: imx: imxrt1170: Document imxrt1170-evk board

Add documentation for imxrt1170-evk.

Signed-off-by: Jesse Taube <Mr.Bossman075@gmail.com>
Reviewed-by: Giulio Benetti <giulio.benetti@benettiengineering.com>

Add index page entry, adjust formatting.
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
diff --git a/doc/board/nxp/index.rst b/doc/board/nxp/index.rst
index 3bd9ed3..9468773 100644
--- a/doc/board/nxp/index.rst
+++ b/doc/board/nxp/index.rst
@@ -14,6 +14,7 @@
    imx93_11x11_evk
    imxrt1020-evk
    imxrt1050-evk
+   imxrt1170-evk
    ls1046ardb
    mx6sabreauto
    mx6sabresd