Further fixes to documentation links

Change-Id: Ib021c721652d96f6c06ea18741f19a72bba1d00f
Signed-off-by: John Tsichritzis <john.tsichritzis@arm.com>
diff --git a/docs/components/arm-sip-service.rst b/docs/components/arm-sip-service.rst
index 9cbf199..e450d37 100644
--- a/docs/components/arm-sip-service.rst
+++ b/docs/components/arm-sip-service.rst
@@ -92,5 +92,5 @@
 *Copyright (c) 2017-2018, Arm Limited and Contributors. All rights reserved.*
 
 .. _SMC Calling Convention: http://infocenter.arm.com/help/topic/com.arm.doc.den0028a/index.html
-.. _Performance Measurement Framework: ./firmware-design.rst#user-content-performance-measurement-framework
-.. _Firmware Design document: ./firmware-design.rst
+.. _Performance Measurement Framework: ../design/firmware-design.rst#user-content-performance-measurement-framework
+.. _Firmware Design document: ../design/firmware-design.rst