Fix typo in plugin.md

[noklam]

Signed-off-by: Nok [email protected]
Follow up on #3013, close #1940.

NOTE: Kedro datasets are moving from kedro.extras.datasets to a separate kedro-datasets package in
kedro-plugins repository. Any changes to the dataset implementations
should be done by opening a pull request in that repository.

Description

Development notes

Checklist

• Read the contributing guidelines
• Signed off each commit with a Developer Certificate of Origin (DCO)
• Opened this PR as a 'Draft Pull Request' if it is work-in-progress
• Updated the documentation to reflect the code changes
• Added a description of this change in the RELEASE.md file
• Added tests to cover my changes
• Checked if this change will affect Kedro-Viz, and if so, communicated that with the Viz team

[stichbury]

🏆

[noklam]

Ping @astrojuanlu

[astrojuanlu]

I approve because now the code looks more similar to what we had before and to what I expected, but I had not tested the version with . and I haven't tested this one, mind you