SPCI is now called PSA FF-A.

Change-Id: Iaa10e0449edf5f6493ab21e648219392b17cc5ec
diff --git a/docs/StyleGuide.md b/docs/StyleGuide.md
index 770d978..1619971 100644
--- a/docs/StyleGuide.md
+++ b/docs/StyleGuide.md
@@ -38,7 +38,7 @@
 These rules apply to comments and other natural language text.
 
 *   Capitalize acronyms.
-    *   CPU, vCPU, VM, EL2, SPCI, QEMU
+    *   CPU, vCPU, VM, EL2, FF-A, QEMU
 *   Spell out Hafnium in full, not Hf.
 *   Use single spaces.
 *   Sentences end with full stops.