Rename catergory->level in declare_clippy_lint macro definition

Author: flip1995

clippy_lints/src/declare_clippy_lint.rs

@@ -4,7 +4,7 @@ macro_rules! declare_clippy_lint {
     (@
         $(#[doc = $lit:literal])*
         pub $lint_name:ident,
-        $category:ident,
+        $level:ident,
         $lintcategory:expr,
         $desc:literal,
         $version_expr:expr,
@@ -15,7 +15,7 @@ macro_rules! declare_clippy_lint {
             $(#[doc = $lit])*
             #[clippy::version = $version_lit]
             pub clippy::$lint_name,
-            $category,
+            $level,
             $desc,
             report_in_external_macro:true
             $(, @eval_always = $eval_always)?