Add `wing secrets` description and example to the documentation

[NathanTarbert]

Description

The documentation is missing the CLI featurewing secrets.

Reference

Add wing secrets to this documentation page - https://www.winglang.io/docs/standard-library/cloud/secret

Community Notes

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[staycoolcall911]

We should just add a link to https://www.winglang.io/docs/tools/cli#store-secrets-wing-secrets in https://www.winglang.io/docs/standard-library/cloud/secret

[NathanTarbert]

Ahh yes, I didn't see this page.

[monadabot]

Congrats! :rocket: This was released in Wing 0.74.50.