update docs

Author: karam-mustafa

docs/delete.md

@@ -1,14 +1,34 @@
 Delete helper
 -----------
+#### drop multi tables
 Suppose you want to drop multiple tables by their names in the database, you can do it with the following implementation.
 ```php
 
     QueryHelperFacade::deleteInstance()
-        ->setTables(['posts', 'users' , 'comments']) // tables names.
+        ->setTables(['posts', 'users' , 'comments']) 
+        // tables names.
+        // or you can select all tables that exists in the database from the below function
+        // ->setAllTablesFromDatabase()
         ->dropMultiTables()
         ->executeAll();
 
 ```
+#### truncate multi tables
+
+Suppose you want to truncate multiple tables by their names in the database, you can do it with the following implementation.
+```php
+
+    QueryHelperFacade::deleteInstance()
+        // tables names.
+        ->setTables(['posts', 'users' , 'comments'])
+        // or you can select all tables that exists in the database from the below function
+        // ->setAllTablesFromDatabase()
+        ->truncateMultiTables()
+        ->executeWithoutPrepare();
+
+```
+
+#### delete large data
 If you have a table that contains a large number of data (maybe millions of records)
 and you want to delete everything contained in this table,
 if you execute the command with one query,
@@ -31,6 +51,8 @@ so this function divides the large query into more queries with an easy-to-use s
             return $table->where('id', '<', 100)->pluck('id')->toArray();
         }); //  this will implement the delete process only on the result of this callback.
 ```
+
+#### drop all tables
 If you want to drop all tables from the database.
 ```php