Update index.md to fix typo and old reference to openwhisk that leads to doc for openzeppelin

[carllippert]

typo. be replaces to. update. replace openwhisk w/ openzep

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[corwintines]

@all-contributors can you add @carllippert for docs

[allcontributors[bot]]

@corwintines

I've put up a pull request to add @carllippert! :tada:

[corwintines]

Hey @carllippert , thanks for the PR :)

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