Update docs: add fixable icon now that autofix is implemented

Author: johanrd

README.md

@@ -418,7 +418,7 @@ rules in templates can be disabled with eslint directives with mustache or html
 | [template-no-scope-outside-table-headings](docs/rules/template-no-scope-outside-table-headings.md)                         | disallow scope attribute outside th elements                      |    |    |    |
 | [template-no-shadowed-elements](docs/rules/template-no-shadowed-elements.md)                                               | disallow ambiguity with block param names shadowing HTML elements |    |    |    |
 | [template-no-unbalanced-curlies](docs/rules/template-no-unbalanced-curlies.md)                                             | disallow unbalanced mustache curlies                              |    |    |    |
-| [template-no-unknown-arguments-for-builtin-components](docs/rules/template-no-unknown-arguments-for-builtin-components.md) | disallow unknown arguments for built-in components                |    |    |    |
+| [template-no-unknown-arguments-for-builtin-components](docs/rules/template-no-unknown-arguments-for-builtin-components.md) | disallow unknown arguments for built-in components                |    | 🔧 |    |
 
 ### Routes
 

docs/rules/template-no-unknown-arguments-for-builtin-components.md

@@ -1,5 +1,7 @@
 # ember/template-no-unknown-arguments-for-builtin-components
 
+🔧 This rule is automatically fixable by the [`--fix` CLI option](https://eslint.org/docs/latest/user-guide/command-line-interface#--fix).
+
 <!-- end auto-generated rule header -->
 
 The builtin components `LinkTo`, `Input`, `Textarea` has list of allowed arguments, and some argument names may be mistyped, this rule trying to highlight possible typos, checking for unknown arguments, also, some components has conflicted and required arguments, rule addressing this behavior.