docs(config.yml): Fix grammatical typos

[bharatr21]

Fix grammatical typos in config.yml

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.

[welcome]

Congratulations on your first contribution to the Serverless Toolkit!
We'd love to say thank you and send you some swag. If you are interested please fill out this form at https://twil.io/hacktoberfest-swag
If you are on the look out for more ways to contribute to open-source, check out a list of some of our repositories at https://github.com/twilio/opensource.
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