Solidity: Documentation: Move `bytes` and `strings` out of "value types" section

[kkagill]

bytes and strings are not value types, so they should not appear in the value types section in the documentation.

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So in the official doc, it says

bytes: Dynamically-sized byte array, see Arrays. Not a value-type!

string: Dynamically-sized UTF-8-encoded string, see Arrays. Not a value-type!

If they are not a value-type, why are they placed in Value Types section? It is quite confusing.

[wjmelements]

https://github.com/ethereum/solidity/pull/4201

[chriseth]

@wjmelements you do not need to cross-reference pull requests, github does that automatically (see above).

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