Update the links for README.md

[lamtrinhdev]

Summary:

Update the links for README.md

Modifications:

Update the link

• https://developer.1password.com/docs/cli/secrets-reference-syntax/ => https://developer.1password.com/docs/cli/secret-reference-syntax/
• https://developer.1password.com/docs/sdks/manage-items#edit-an-item => https://developer.1password.com/docs/sdks/manage-items#update-an-item

Result:

Correct the reference links for secret reference URIs and Update items