fix: document that imaginary numbers are not supported, in go-gno-compatibility.md

[odeke-em]

Imaginary values are not supported in Gno. Found by fuzzing and compatibility checks between Go and Gno

package main

const (
	Nj = 0i
)

[Gno2D2]

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[thehowl]

the imag type doesn't actually exist, the types are complex64 and complex128 which are stated above to not be supported. We talk about "imag" indirectly with the reference for builtin:

builtin is a "fake" package that exists to document the behaviour of some builtin functions. The "fake" package does not currently exist in Gno, but all functions up to Go 1.17 exist, except for those relating to complex or channel types.

For searchability, you can add real and imag in that footnote.

[odeke-em]

Thank you for the review @thehowl. Kudos for the good knowledge of the doc's content.