update: manage groups role description

[staceysalamon-aiven]

Describe your changes

Checklist

• The first paragraph of the page is on one line.
• The other lines have a line break at 90 characters.
• I checked the output.
• I applied the style guide.
• My links start with /docs/.

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[rsalevsky]

The change is that group members can't be updated when the group has assigned permissions. (Similar to organization:app_users:write ..have not been granted any permissions)

[staceysalamon-aiven]

The change is that group members can't be updated when the group has assigned permissions. (Similar to organization:app_users:write ..have not been granted any permissions)

Hey @rsalevsky , sorry, with all the different changes in the permissions and conflicts this one got reverted back to the old text accidentally. I've fixed the group description now. Lmk if you want any other changes. Thanks! 🙏