[Form] Removed Integer rounding-related options

Scale and roundingMode options are hardcoded for IntegerType.
These changes result from the discussion introduced by symfony/symfony#26734.

Author: dlabouesse

reference/forms/types/integer.rst

@@ -9,16 +9,10 @@ good at handling data that's in an integer form. The input ``number`` field
 looks like a text box, except that - if the user's browser supports HTML5
 - it will have some extra front-end functionality.
 
-This field has different options on how to handle input values that aren't
-integers. By default, all non-integer values (e.g. 6.78) will round down
-(e.g. 6).
-
 +-------------+-----------------------------------------------------------------------+
 | Rendered as | ``input`` ``number`` field                                            |
 +-------------+-----------------------------------------------------------------------+
 | Options     | - `grouping`_                                                         |
-|             | - `scale`_                                                            |
-|             | - `rounding_mode`_                                                    |
 +-------------+-----------------------------------------------------------------------+
 | Overridden  | - `compound`_                                                         |
 | options     |                                                                       |
@@ -47,37 +41,6 @@ Field Options
 
 .. include:: /reference/forms/types/options/grouping.rst.inc
 
-.. include:: /reference/forms/types/options/scale.rst.inc
-
-rounding_mode
-~~~~~~~~~~~~~
-
-**type**: ``integer`` **default**: ``IntegerToLocalizedStringTransformer::ROUND_DOWN``
-
-By default, if the user enters a non-integer number, it will be rounded
-down. There are several other rounding methods and each is a constant
-on the :class:`Symfony\\Component\\Form\\Extension\\Core\\DataTransformer\\IntegerToLocalizedStringTransformer`:
-
-* ``IntegerToLocalizedStringTransformer::ROUND_DOWN`` Round towards zero.
-
-* ``IntegerToLocalizedStringTransformer::ROUND_FLOOR`` Round towards negative
-  infinity.
-
-* ``IntegerToLocalizedStringTransformer::ROUND_UP`` Round away from zero.
-
-* ``IntegerToLocalizedStringTransformer::ROUND_CEILING`` Round towards
-  positive infinity.
-
-* ``IntegerToLocalizedStringTransformer::ROUND_HALF_DOWN`` Round towards the
-  "nearest neighbor". If both neighbors are equidistant, round down.
-
-* ``IntegerToLocalizedStringTransformer::ROUND_HALF_EVEN`` Round towards the
-  "nearest neighbor". If both neighbors are equidistant, round towards the
-  even neighbor.
-
-* ``IntegerToLocalizedStringTransformer::ROUND_HALF_UP`` Round towards the
-  "nearest neighbor". If both neighbors are equidistant, round up.
-
 Overridden Options
 ------------------