Update weather.html to mention Onecall 3.0 option

[sanderkob]

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• [ ] Bugfix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)

Proposed changes

#issue_number 316 added onecall 3.0 to the description of "combined current weather/forecast for",

Checklist

• [ ] I have read the contribution guidelines
• [ ] For non-bugfix PRs, I have discussed this change on the forum/slack team.
• [ ] I have run grunt to verify the unit tests pass
• [ ] I have added suitable unit tests to cover the new/changed functionality

[linux-foundation-easycla[bot]]

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