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Merge pull request#1732 from jeanmonod/documentation-for-PR4714

[Config] Documentation of the new numerical type handling

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Original file line number	Diff line number	Diff line change
`@@ -100,10 +100,39 @@ node definition. Node type are available for:`
`100`	`100`	`* scalar`
`101`	`101`	`* boolean`
`102`	`102`	`* array`
	`103`	`+* enum (new in 2.1)`
	`104`	`+* integer (new in 2.2)`
	`105`	`+* float (new in 2.2)`
`103`	`106`	`* variable (no validation)`
`104`	`107`
`105`	`108`	and are created with ``node($name, $type)`` or their associated shortcut
`106`		-``xxxxNode($name)`` method.
	`109`	+ ``xxxxNode($name)`` method.
	`110`	`+`
	`111`	`+Numeric node constraints`
	`112`	`+~~~~~~~~~~~~~~~~~~~~~~~~`
	`113`	`+`
	`114`	`+..versionadded::2.2`
	`115`	`+`
	`116`	`+ The numeric (float and integer) nodes are new in 2.2`
	`117`	`+`
	`118`	`+Numeric node (float and integer) provide two extra constraints min() and`
	`119`	`+ max() allowing to validate the value:`
	`120`	`+`
	`121`	`+..code-block::php`
	`122`	`+`
	`123`	`+ $rootNode`
	`124`	`+ ->children()`
	`125`	`+ ->integerNode('positive_value')`
	`126`	`+ ->min(0)`
	`127`	`+ ->end()`
	`128`	`+ ->floatNode('big_value')`
	`129`	`+ ->max(5E45)`
	`130`	`+ ->end()`
	`131`	`+ ->integerNode('value_inside_a_range')`
	`132`	`+ ->min(-50)->max(50)`
	`133`	`+ ->end()`
	`134`	`+ ->end()`
	`135`	`+ ;`
`107`	`136`
`108`	`137`	`Array nodes`
`109`	`138`	`~~~~~~~~~~~`

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