MAINTAINERS: Correct Andrew Jeffery Discord Username

Change-Id: Ic7e189e2583691ba4da5b4f03bd1e2ec7c923c14
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 76a5a55..ec0b908 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -52,5 +52,5 @@
 M:  Brad Bishop <bradleyb@fuzziesquirrel.com> <radsquirrel!>
 M:  Patrick Williams <patrick@stwcx.xyz> <stwcx!>
 R:  Adriana Kobylak <anoo@us.ibm.com> <anoo!>
-R:  Andrew Jeffery <andrew@aj.id.au> <amboar!>
+R:  Andrew Jeffery <andrew@aj.id.au> <arj!>
 R:  Gunnar Mills <gmills@linux.vnet.ibm.com> <GunnarM!>