VEML7700 and VEML6030 light sensors

[latonita]

Description:

Docs for VEML7700 and VEML6030 light sensors component

Related issue (if applicable): fixes https://github.com/esphome/feature-requests/issues/2493

Pull request in esphome with YAML changes (if applicable): esphome/esphome#6067

Checklist:

• [X] I am merging into next because this is new documentation that has a matching pull-request in esphome as linked above.
  or

• [ ] I am merging into current because this is a fix, change and/or adjustment in the current documentation and is not for a new component or feature.

• [X] Link added in /index.rst when creating new documents for new components or cookbook.

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[esphome[bot]]

Please take a look at the requested changes, and use the Ready for review button when you are done, thanks :+1:

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[latonita]

Some small (mostly grammar) corrections

Thanks a lot for corrections. I made couple minor updates and its ready for review.