Update active-record.md

Quick typo fix

Author: TomJaeger

docs/development/legacy/database/active-record.md

@@ -494,7 +494,7 @@ The second parameter lets you set a result offset:
 
     ee()->db->limit(10, 20);  // Produces: LIMIT 20, 10 (in MySQL.  Other databases have slightly different syntax)
 
-### `ffset($offset)`
+### `offset($offset)`
 
 | Parameter | Type                  | Description                  |
 | --------- | --------------------- | ---------------------------- |