docs(versal): update custom SIP service

Correct the platform-specific custom SiP service doc
VERSAL_SIP_SVC_CUSTOM to use the common SOC_SIP_SVC_CUSTOM.

Change-Id: Iab75295432aec1329d3aa69f30897c8aaa5a7b9e
Signed-off-by: Prasad Kummari <prasad.kummari@amd.com>
diff --git a/docs/plat/xilinx-versal.rst b/docs/plat/xilinx-versal.rst
index a654a0b..7ac0124 100644
--- a/docs/plat/xilinx-versal.rst
+++ b/docs/plat/xilinx-versal.rst
@@ -75,7 +75,7 @@
 CUSTOM SIP Service Support
 --------------------------
 
-- Dedicated SMC FID ``VERSAL_SIP_SVC_CUSTOM(0x82002000)`` (32-bit) /
+- Dedicated SMC FID ``SOC_SIP_SVC_CUSTOM(0x82002000)`` (32-bit) /
   ``(0xC2002000)`` (64-bit) is used by a custom package for providing
   CUSTOM SIP service.