Adds information that ignore() is not unique to insert

Adds information that ignore() can be used in insertBatch, update and delete (when database supports it).
Not really clear on the docs at the moment.

Author: eSkiSo

user_guide_src/source/database/query_builder.rst

@@ -809,7 +809,8 @@ $builder->ignore()
 
 Generates an insert ignore string based on the data you supply, and runs the
 query. So if an entry with the same primary key already exists, the query won't be inserted.
-You can optionally pass an **boolean** to the method. Here is an example using the array of the above example:
+You can optionally pass an **boolean** to the method. Can also be used on **insertBatch**, **update** and **delete** (when supported).
+Here is an example using the array of the above example:
 
 .. literalinclude:: query_builder/078.php