Inconsistent use of Seq instead of Collection

[exoego]

The below 2 pages uses type Seq instead of Collection.
https://superruzafa.github.io/visual-scala-reference/isDefinedAt_Seq
https://superruzafa.github.io/visual-scala-reference/isDefinedAt_Map

Is this intended? If so, I would like to know why.
If not intended, it should be corrected.

[superruzafa]

It's intended in the sense that IisDefinedAt is defined only for Seq and Map but not Set.
Anyway there is a typo in the documentation where Seq is duplicated in the two documents that I'll fix.