Expand documentation of NEWARRAY and NEWSTRUCT opcodes

[fyrchik]

PR #91 implemented ability to convert from Array to Struct and vice
versa.
#91

This PR adds proper doc comments.

[codecov-io]

Codecov Report

Merging #200 into master will not change coverage.
The diff coverage is n/a.

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##           master     #200   +/-   ##
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  Coverage   79.32%   79.32%           
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  Files          16       16           
  Lines        1422     1422           
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  Hits         1128     1128           
  Misses        294      294

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[roman-khimov]

I think you should also mention here the thing that was discussed in nspcc-dev/neo-go#360 --- after #91 NEWARRAY on array and NEWSTRUCT on struct are effectively noops.

[devhawk]

@shargon we should make sure https://github.com/neo-ngd/NEO3-Development-Guide is up to date with correct docs. Can you either file an issue or make sure those docs are up to date w/ latest source changes?

[shargon]

@devhawk NEWARRAY and NEWSTRUCT must be updated in https://github.com/neo-ngd/NEO3-Development-Guide/tree/master/en/NeoVM#newarray because now in order to convert between types, can receive an Array and a struct.

Also was added some opcodes in the enum: from PUSHBYTES1 to PUSHBYTES75

[devhawk]

You can file bugs on that repo: https://github.com/neo-ngd/NEO3-Development-Guide/issues