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Improve scalar literal format documentation (#7651)

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* Improve scalar literal format documentation

Signed-off-by: Julius Volz <julius.volz@gmail.com>

* Address review comments

Signed-off-by: Julius Volz <julius.volz@gmail.com>

* Fixup

Signed-off-by: Julius Volz <julius.volz@gmail.com>
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docs/querying/basics.md
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@ -55,10 +55,23 @@ Example:
### Float literals
Scalar float values can be literally written as numbers of the form
`[-](digits)[.(digits)]`.
Scalar float values can be written as literal integer or floating-point numbers in the format (whitespace only included for better readability):
[-+]?(
[0-9]*\.?[0-9]+([eE][-+]?[0-9]+)?
| 0[xX][0-9a-fA-F]+
| [nN][aA][nN]
| [iI][nN][fF]
)
Examples:
23
-2.43
3.4e-9
0x8f
-Inf
NaN
## Time series Selectors