In the
Table section of the user manual, there is this example:
[.rolename]
|===
|Cell in column 1, row 1
|Cell in column 2, row 1
|Cell in column 3, row 1
|Cell in column 1, row 2
|Cell in column 2, row 2
|Cell in column 3, row 2
|===
In Chrome I get this preview:

Is it a bug in the implementation or in the documentation?