doc: serde_json::Value bridging example/doc

[dj8yfo]

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[dj8yfo]

@race-of-sloths include

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[frol]

This example looks great to me, and I prefer it to be an example rather than a baked-in support for serde-json, which would create an odd dependency for borsh.

Before merging it, though, I would love to hear the feedback and thoughts of the original author of the PR.

[larry0x]

I would love to hear the feedback and thoughts of the original author of the PR.

@dj8yfo @frol This looks good to me, and the points you raised in #312 are valid.

[frol]

@race-of-sloths score 5