Correct XML documentation of BulkSubscribeAttribute

[elKei24]

Description

The XML documentation comments of BulkSubscribeAttribute were confusing, probably due to copy-paste without adaption. I changed them to something more helpful.

Issue reference

We strive to have all PR being opened based on an issue, where the problem or feature have been discussed prior to implementation.

Please reference the issue this PR will close: N/A

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Code compiles correctly
• Created/updated tests
• Extended the documentation

[WhitWaldo]

Looks good to me - thank you for spotting and correcting this!

[marcduiker]

@holopin-bot @elKei24 Thank you Elias! Here's a digital badge as a small token of appreciation.

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