boards: arc: Update outdated links

This commit updates the outdated ARC board links.

Signed-off-by: Stephanos Ioannidis <[email protected]>

Author: stephanosio

boards/arc/emsdp/doc/index.rst

@@ -45,7 +45,7 @@ The following table shows the hardware features supported for different core con
 +-----------+-----+-----+------+------+----------+------+-------+
 
 For hardware feature details, refer to : `ARC EM Software Development Platform
-<https://embarc.org/embarc_osp/doc/build/html/board/emsdp.html>`__
+<https://embarc.org/project/arc-em-software-development-platform-sdp/>`__
 
 
 Programming and Debugging

boards/arc/iotdk/doc/index.rst

@@ -26,7 +26,7 @@ Hardware
 ********
 
 For hardware feature details, refer to : `ARC IoT Development Kit
-<http://embarc.org/embarc_osp/doc/build/html/board/iotdk.html>`__
+<https://embarc.org/project/arc-iot-development-kit/>`__
 
 
 Programming and Debugging

boards/arc/qemu_arc/doc/index.rst

@@ -99,4 +99,4 @@ References
 **********
 
 1.`Programmer’s Reference Manual for ARC HS
-   <https://www.synopsys.com/dw/doc.php/ds/cc/programmers-reference-manual-ARC-HS.pdf>`_
+   <https://www.synopsys.com/dw/doc.php/iip/dwc_arc_hs4xd/latest/doc/ARC_V2_PublicProgrammers_Reference.pdf>`_