Update example.env

[mhuynh5757]

Submission Checklist

• The README.md reflects new features
• The CHANGELOG.md reflects any feature, bug fixes, or known issues made in the source code
• New unit tests and integration tests have beed added
• Code coverage is more or equal to the previous coverage
• A visual inspection of the Files changed tab was made prior to submitting the pull request ensuring the style guide was followed
• CI pipeline is green
• Included screenshot if necessary

Description

This PR removes a broken link from our server/example.env file. Thanks to #143 for bringing this to our attention.

Breakdown

• Remove broken link.

Validation

• N/A

Additional Notes

N/A

Contributing to Twilio

All third-party contributors acknowledge that any contributions they provide will be made under the same open-source license that the open-source project is provided under.

• I acknowledge that all my contributions will be made under the project's license.

[charliesantos]

Instead of removing, do we have an updated link that provides more information about incoming calls, push credential sid, etc?

[OskarD]

As someone who attempted to use this, I could not finish this without the documentation that was supposed to be at the link. If someone like me should be able to use this in the future, this is definitely important 👍