Outdated info about default function visibility

[aspiers]

Section 5 ("Default Visibilities") is out of date; functions no longer default to public:

• Change default function visibility to internal (or private?) argotorg/solidity#2608
• Issue error if no visibility is specified (on 0.5.0) argotorg/solidity#3613
• doc says functions are by default internal - parity exploit argotorg/solidity#2617

[aspiers]

Also https://docs.soliditylang.org/en/latest/050-breaking-changes.html#explicitness-requirements

[AgeManning]

Thanks for raising this.

We need to go through and update a lot of the things raised here to match the latest solidity version

[8bit-krip]

can i take it ?