Update extensibility docs

OpenZeppelin / cairo-contracts

OpenZeppelin Contracts written in Cairo for Starknet, a decentralized ZK Rollup

https://docs.openzeppelin.com/contracts-cairo

MIT License

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Closed andrew-fleming closed 7 months ago

andrew-fleming commented 7 months ago

Fixes #569.

This PR also proposes to change the Extensibility name to Using Components.

ericnordelo commented 7 months ago

Let's not forget to add the entry to the CHANGELOG, even when this PR was created before and has not the updated PULL_REQUEST_TEMPLATE.