Button: redundant prop in Vertical Group example

[andreipfeiffer]

Steps to Reproduce

1. Look at the docs
2. https://react.semantic-ui.com/elements/button#button-example-group-vertical

Expected
The last button (bottom) from the vertical group should have the top-left corner not rounded.

Result
Instead, it is rounded.

Testcase
https://react.semantic-ui.com/elements/button#button-example-group-vertical

Possible fix
The problem seams to be related to the fact that the parent has the classes top attached.
Those classes are used apparently by the Vertically Attached examples.
If you remove attached='top' from the example, it looks fine.

[layershifter]

@andreipfeiffer Thanks for report, looks like a copy-paste issue. We should simply remove attached='top' from this example.

[andreipfeiffer]

Glad to help.
BTW, great work guys.

[andreipfeiffer]

@layershifter I want to create a PR for this. Is this an accepted commit message?
"docs(Button): redundant prop in Vertical Group example (#1697)"

[layershifter]

@andreipfeiffer "docs(Button): remove redundant prop in Vertical Group example"