encoding/json: clarify omitempty option for {array,slice,map,string}

[callthingsoff]

This CL is inspired by:
#29310 (comment)

When I read omitempty option in encoding/xml package, I find it's
a bit different than encoding/json package.

I think it's more precise to say:
"any array, slice, map, or string of length zero."

Update #29310

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Patch Set 1:

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Patch Set 1:

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Patch Set 1: Code-Review+2

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[Hadihoseinnejad1992]

Hadihoseinnejad92

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This PR is being closed because golang.org/cl/621835 has been merged.