xml: Update spelling of entity &arm;

"ARM" -> "Arm"

Signed-off-by: Andreas Färber <afaerber@suse.com>

Author: afaerber

xml/entity-decl.ent

@@ -219,7 +219,7 @@
 <!ENTITY ppc           "POWER">
 <!ENTITY em64t         "Intel EM64T">
 <!ENTITY intel64       "Intel 64">
-<!ENTITY arm           "ARM">
+<!ENTITY arm           "Arm">
 <!ENTITY aarch64       "AArch64">
 <!ENTITY arm64         "&arm; &aarch64;">