docs: Fix doc for incorrect use of PointValues

[linghengqian]

Closes #219.
Closes #220.

Proposed Changes

Briefly describe your proposed changes:

• Fix doc for incorrect use of PointValues.
• Fix incorrect usage of csharp by problem template.
• Maybe there is no need to update https://github.com/InfluxCommunity/influxdb3-java/blob/main/CHANGELOG.md ?

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• A test has been added if appropriate
• Tests pass
• Commit messages are conventional
• Sign CLA (if not already signed)

[linghengqian]

• I don't understand why I can't see the Google Form when I'm logged in to my Google Account. I have to open an InPrivate window in Microsoft Edge to write the ICLA form.
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[bednar]

@linghengqian thx for this PR 👍

LGTM 🚀