Clarify Counting of Query-Spanning Reads in Documentation

[DarioS]

This example produces a count of 1 which I expected it to, but others might expect a count of zero, because the read spans the query coordinates and none of its matching bases fall within the query. I suppose that the query is typically much bigger (e.g. transcript) than the subject (e.g. read) unlike the example below (e.g. short variant).

GA <- GAlignments(seqnames=Rle("chr1"), pos=1L, cigar="50M10D50M", strand=Rle(factor('+', levels = c('+', '-', '*'))))
countOverlaps(GRanges("chr1", IRanges(51, 60)), GA)

Is there somewhere in the vignette that could provide a clarifying explanation in time for the next version?