docs: fix broken Juno links

Certain links to Juno documentation point to a location that were
removed at some point, or are unused. Fix links to point to the latest
available version on Arm's public documentation site, and remove those
that are no longer being used.

Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>
Change-Id: I59202767db8834e9c302b2826f3faee47d3a5edd
diff --git a/docs/perf/psci-performance-juno.rst b/docs/perf/psci-performance-juno.rst
index eab3e4d..7418669 100644
--- a/docs/perf/psci-performance-juno.rst
+++ b/docs/perf/psci-performance-juno.rst
@@ -286,7 +286,7 @@
 
 --------------
 
-*Copyright (c) 2019-2020, Arm Limited and Contributors. All rights reserved.*
+*Copyright (c) 2019-2023, Arm Limited and Contributors. All rights reserved.*
 
-.. _Juno R1 platform: https://static.docs.arm.com/100122/0100/arm_versatile_express_juno_r1_development_platform_(v2m_juno_r1)_technical_reference_manual_100122_0100_05_en.pdf
+.. _Juno R1 platform: https://developer.arm.com/documentation/100122/latest/
 .. _TF master as of 31/01/2017: https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git/tree/?id=c38b36d