fconf: Add documentation

Change-Id: I606f9491fb6deebc6845c5b9d7db88fc5c895bd9
Signed-off-by: Louis Mayencourt <louis.mayencourt@arm.com>
diff --git a/docs/components/index.rst b/docs/components/index.rst
index f1904c0..6a6b1b0 100644
--- a/docs/components/index.rst
+++ b/docs/components/index.rst
@@ -9,6 +9,7 @@
    spd/index
    arm-sip-service
    exception-handling
+   fconf
    firmware-update
    platform-interrupt-controller-API
    ras