Fix typo L12n -> L10n (rjsf-team#4332)

Author: SalvatoreT

CHANGELOG.md

@@ -1994,7 +1994,7 @@ const Component = () => {
 
 ## @rjsf/validator-ajv8
 
-- Support for localization (L12n) on a customized validator using a `Localizer` function passed as a second parameter to `customizeValidator()`, fixing (https://github.com/rjsf-team/react-jsonschema-form/pull/846, and https://github.com/rjsf-team/react-jsonschema-form/issues/1195)
+- Support for localization (L10n) on a customized validator using a `Localizer` function passed as a second parameter to `customizeValidator()`, fixing (https://github.com/rjsf-team/react-jsonschema-form/pull/846, and https://github.com/rjsf-team/react-jsonschema-form/issues/1195)
 - Fixed the `README.md` to correct the package name in several places to match the actual package
 
 ## Dev / docs / playground

packages/docs/docs/usage/validation.md

@@ -703,7 +703,7 @@ const validator = customizeValidator({ AjvClass: Ajv2019 });
 render(<Form schema={schema} validator={validator} />, document.getElementById('app'));
 ```
 
-### Localization (L12n) support
+### Localization (L10n) support
 
 The Ajv 8 validator supports the localization of error messages using [ajv-i18n](https://github.com/ajv-validator/ajv-i18n).
 In addition, you may provide a custom solution by implementing a function that conforms to the `Localizer` interface if your language is not supported.