fix jsdoc @ alter-table-add-index-builder.

src/schema/alter-table-add-index-builder.ts

@@ -26,6 +26,23 @@ export class AlterTableAddIndexBuilder
 
   /**
    * Makes the index unique.
+   *
+   * ### Examples
+   *
+   * ```ts
+   * await db.schema
+   *   .alterTable('person')
+   *   .addIndex('person_first_name_index')
+   *   .unique()
+   *   .column('email')
+   *   .execute()
+   * ```
+   *
+   * The generated SQL (MySQL):
+   *
+   * ```sql
+   * alter table `person` add unique index `person_first_name_index` (`email`)
+   * ```
    */
   unique(): AlterTableAddIndexBuilder {
     return new AlterTableAddIndexBuilder({
@@ -48,11 +65,11 @@ export class AlterTableAddIndexBuilder
    *
    * ```ts
    * await db.schema
-   *         .alterTable('person')
-   *         .createIndex('person_first_name_and_age_index')
-   *         .column('first_name')
-   *         .column('age desc')
-   *         .execute()
+   *   .alterTable('person')
+   *   .addIndex('person_first_name_and_age_index')
+   *   .column('first_name')
+   *   .column('age desc')
+   *   .execute()
    * ```
    *
    * The generated SQL (MySQL):
@@ -84,10 +101,10 @@ export class AlterTableAddIndexBuilder
    *
    * ```ts
    * await db.schema
-   *         .alterTable('person')
-   *         .addIndex('person_first_name_and_age_index')
-   *         .columns(['first_name', 'age desc'])
-   *         .execute()
+   *   .alterTable('person')
+   *   .addIndex('person_first_name_and_age_index')
+   *   .columns(['first_name', 'age desc'])
+   *   .execute()
    * ```
    *
    * The generated SQL (MySQL):
@@ -144,6 +161,23 @@ export class AlterTableAddIndexBuilder
 
   /**
    * Specifies the index type.
+   *
+   * ### Examples
+   *
+   * ```ts
+   * await db.schema
+   *   .alterTable('person')
+   *   .addIndex('person_first_name_index')
+   *   .column('first_name')
+   *   .using('hash')
+   *   .execute()
+   * ```
+   *
+   * The generated SQL (MySQL):
+   *
+   * ```sql
+   * alter table `person` add index `person_first_name_index` (`first_name`) using hash
+   * ```
    */
   using(indexType: IndexType): AlterTableAddIndexBuilder
   using(indexType: string): AlterTableAddIndexBuilder