Correct input checkbox render as

Checkboxes render as `<input type="checkbox">` not `<input type="text">`

This typo exists in all versions of the docs 2.0, 2.1, master.

Thanks!

Author: johnkary

reference/forms/types/checkbox.rst

@@ -9,7 +9,7 @@ has a Boolean value: if the box is checked, the field will be set to true,
 if the box is unchecked, the value will be set to false.
 
 +-------------+------------------------------------------------------------------------+
-| Rendered as | ``input`` ``text`` field                                               |
+| Rendered as | ``input`` ``checkbox`` field                                           |
 +-------------+------------------------------------------------------------------------+
 | Options     | - `value`_                                                             |
 +-------------+------------------------------------------------------------------------+