fixed incorrect error key

Author: mtrezza

src/ApiMailAdapter.js

@@ -30,7 +30,7 @@ class ApiMailAdapter extends MailAdapter {
 
     // Ensure API callback is set
     if (typeof apiCallback !== 'function') {
-      throw Errors.Error.apiClientCallbackNoFuncion;
+      throw Errors.Error.apiCallbackNoFunction;
     }
 
     // Initialize
@@ -311,7 +311,7 @@ class ApiMailAdapter extends MailAdapter {
    * @description Loads a file's content.
    * @param {String} path The file path.
    * @param {String} locale The locale if a localized version of the file should be
-   * loaded if available, or `undefined` if no localiziation should occur.
+   * loaded if available, or `undefined` if no localization should occur.
    * @returns {Promise<Buffer>} The file content.
    */
   async _loadFile(path, locale) {

src/Errors.js

@@ -16,7 +16,7 @@ class Errors extends Error {
       configurationInvalid: new Error('ApiMailAdapter: configuration is missing or invalid.'),
       templatesInvalid: new Error('ApiMailAdapter: templates are missing or invalid.'),
       templateContentPathInvalid: new Error('ApiMailAdapter: template content path is invalid.'),
-      apiCallbackNoFuncion: new Error('ApiMailAdapter: API callback is not a function.'),
+      apiCallbackNoFunction: new Error('ApiMailAdapter: API callback is not a function.'),
       templateCallbackNoFunction: new Error('ApiMailAdapter: placeholder callback is not a function.'),
       localeCallbackNoFunction: new Error('ApiMailAdapter: locale callback is not a function.'),
       templateConfigurationNoName: new Error('ApiMailAdapter: template name is missing.'),