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feature#7196 Explained how to improve the readability of long numeric literals (javiereguiluz)

This PR was squashed before being merged into the 3.2 branch (closes#7196).Discussion----------Explained how to improve the readability of long numeric literalsThisfixes#7183.Commits-------494a9ae Explained how to improve the readability of long numeric literals

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Original file line number	Diff line number	Diff line change
`@@ -203,6 +203,25 @@ changed using the third argument as follows::`
`203`	`203`	`foo:bar`
`204`	`204`	`bar:baz`
`205`	`205`
	`206`	`+Numeric Literals`
	`207`	`+................`
	`208`	`+`
	`209`	`+Long numeric literals, being integer, float or hexadecimal, are known for their`
	`210`	`+poor readability in code and configuration files. That's why YAML files allow to`
	`211`	`+add underscores to improve their readability:`
	`212`	`+`
	`213`	`+..code-block::yaml`
	`214`	`+`
	`215`	`+parameters:`
	`216`	`+credit_card_number:1234_5678_9012_3456`
	`217`	`+long_number:10_000_000_000`
	`218`	`+pi:3.14159_26535_89793`
	`219`	`+hex_words:0x_CAFE_F00D`
	`220`	`+`
	`221`	+During the parsing of the YAML contents, all the ``_`` characters are removed
	`222`	`+from the numeric literal contents, so there is not a limit in the number of`
	`223`	`+underscores you can include or the way you group contents.`
	`224`	`+`
`206`	`225`	`Advanced Usage: Flags`
`207`	`226`	`---------------------`
`208`	`227`

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