empty-liner-after-outer-attr: make lint adhere to lint message convention

Author: matthiaskrgr

clippy_lints/src/attrs.rs

@@ -605,7 +605,7 @@ fn check_empty_line_after_outer_attr(cx: &EarlyContext<'_>, item: &rustc_ast::as
                         cx,
                         EMPTY_LINE_AFTER_OUTER_ATTR,
                         begin_of_attr_to_item,
-                        "Found an empty line after an outer attribute. \
+                        "found an empty line after an outer attribute. \
                         Perhaps you forgot to add a `!` to make it an inner attribute?",
                     );
                 }

tests/ui/empty_line_after_outer_attribute.stderr

@@ -1,4 +1,4 @@
-error: Found an empty line after an outer attribute. Perhaps you forgot to add a `!` to make it an inner attribute?
+error: found an empty line after an outer attribute. Perhaps you forgot to add a `!` to make it an inner attribute?
   --> $DIR/empty_line_after_outer_attribute.rs:11:1
    |
 LL | / #[crate_type = "lib"]
@@ -9,15 +9,15 @@ LL | | fn with_one_newline_and_comment() { assert!(true) }
    |
    = note: `-D clippy::empty-line-after-outer-attr` implied by `-D warnings`
 
-error: Found an empty line after an outer attribute. Perhaps you forgot to add a `!` to make it an inner attribute?
+error: found an empty line after an outer attribute. Perhaps you forgot to add a `!` to make it an inner attribute?
   --> $DIR/empty_line_after_outer_attribute.rs:23:1
    |
 LL | / #[crate_type = "lib"]
 LL | |
 LL | | fn with_one_newline() { assert!(true) }
    | |_
 
-error: Found an empty line after an outer attribute. Perhaps you forgot to add a `!` to make it an inner attribute?
+error: found an empty line after an outer attribute. Perhaps you forgot to add a `!` to make it an inner attribute?
   --> $DIR/empty_line_after_outer_attribute.rs:28:1
    |
 LL | / #[crate_type = "lib"]
@@ -26,23 +26,23 @@ LL | |
 LL | | fn with_two_newlines() { assert!(true) }
    | |_
 
-error: Found an empty line after an outer attribute. Perhaps you forgot to add a `!` to make it an inner attribute?
+error: found an empty line after an outer attribute. Perhaps you forgot to add a `!` to make it an inner attribute?
   --> $DIR/empty_line_after_outer_attribute.rs:35:1
    |
 LL | / #[crate_type = "lib"]
 LL | |
 LL | | enum Baz {
    | |_
 
-error: Found an empty line after an outer attribute. Perhaps you forgot to add a `!` to make it an inner attribute?
+error: found an empty line after an outer attribute. Perhaps you forgot to add a `!` to make it an inner attribute?
   --> $DIR/empty_line_after_outer_attribute.rs:43:1
    |
 LL | / #[crate_type = "lib"]
 LL | |
 LL | | struct Foo {
    | |_
 
-error: Found an empty line after an outer attribute. Perhaps you forgot to add a `!` to make it an inner attribute?
+error: found an empty line after an outer attribute. Perhaps you forgot to add a `!` to make it an inner attribute?
   --> $DIR/empty_line_after_outer_attribute.rs:51:1
    |
 LL | / #[crate_type = "lib"]