I think this wording was actually intended and correct. According to godoc:

As with packages (above) and funcs (below), doc comments for types start with complete sentences naming the declared symbol. An explicit subject often makes the wording clearer, and it makes the text easier to search, whether on a web page or a command line. For example:

See specifically the example for Sort showing a similar pattern:

package sort

// Sort sorts data in ascending order as determined by the Less method.
// It makes one call to data.Len to determine n and O(n*log(n)) calls to
// data.Less and data.Swap. The sort is not guaranteed to be stable.
func Sort(data Interface) {
    ...
}