Slightly better summary for E0538

Havvy · Havvy · commit e9e0ca0382e9 · 2018-06-11T17:21:15.000-07:00
diff --git a/src/libsyntax/diagnostic_list.rs b/src/libsyntax/diagnostic_list.rs
@@ -94,7 +94,7 @@ https://doc.rust-lang.org/reference.html#conditional-compilation
 "##,
 
 E0538: r##"
-Attribute contains multiple of the same meta item.
+Attribute contains same meta item more than once.
 
 Erroneous code example:
 
