enum-variant-names: make lint adhere to lint message convention

clippy_lints/src/enum_variants.rs

@@ -183,10 +183,10 @@ fn check_variant(
             && name.chars().nth(item_name_chars).map_or(false, |c| !c.is_lowercase())
             && name.chars().nth(item_name_chars + 1).map_or(false, |c| !c.is_numeric())
         {
-            span_lint(cx, lint, var.span, "Variant name starts with the enum's name");
+            span_lint(cx, lint, var.span, "variant name starts with the enum's name");
         }
         if partial_rmatch(item_name, &name) == item_name_chars {
-            span_lint(cx, lint, var.span, "Variant name ends with the enum's name");
+            span_lint(cx, lint, var.span, "variant name ends with the enum's name");
         }
     }
     let first = &def.variants[0].ident.name.as_str();

tests/ui/enum_variants.stderr

@@ -1,4 +1,4 @@
-error: Variant name ends with the enum's name
+error: variant name ends with the enum's name
   --> $DIR/enum_variants.rs:16:5
    |
 LL |     cFoo,
@@ -6,19 +6,19 @@ LL |     cFoo,
    |
    = note: `-D clippy::enum-variant-names` implied by `-D warnings`
 
-error: Variant name starts with the enum's name
+error: variant name starts with the enum's name
   --> $DIR/enum_variants.rs:27:5
    |
 LL |     FoodGood,
    |     ^^^^^^^^
 
-error: Variant name starts with the enum's name
+error: variant name starts with the enum's name
   --> $DIR/enum_variants.rs:28:5
    |
 LL |     FoodMiddle,
    |     ^^^^^^^^^^
 
-error: Variant name starts with the enum's name
+error: variant name starts with the enum's name
   --> $DIR/enum_variants.rs:29:5
    |
 LL |     FoodBad,