Nokia RX-51: Convert documentation to rst format

Convert documentation to rst format

Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
diff --git a/doc/board/index.rst b/doc/board/index.rst
index 5607e1f..75c34c4 100644
--- a/doc/board/index.rst
+++ b/doc/board/index.rst
@@ -22,6 +22,7 @@
    intel/index
    kontron/index
    microchip/index
+   nokia/index
    nxp/index
    openpiton/index
    qualcomm/index