flexnet: rebuild

Change-Id: I17925064e1a476461da2ca260e74812accd942aa
diff --git a/centos8-amd64-flexnet/README.md b/centos8-amd64-flexnet/README.md
index 460eb24..30dc2d0 100644
--- a/centos8-amd64-flexnet/README.md
+++ b/centos8-amd64-flexnet/README.md
@@ -1,5 +1,5 @@
-docker run -d --mac-address="[LICENSE_MAC_ADDRESS]" \
--h [LICENSE_HOSTNAME] \
+docker run -d --mac-address="[LICENSE\_MAC\_ADDRESS]" \
+-h [LICENSE\_HOSTNAME] \
 -v /var/flexnet:/var/flexnet:ro \
 -p 2080:2080 -p 27000-27009:27000-27009 \
 trustedfirmware/flexnet