Clarify binary operators generally, including pipe #127
Description
The new pipe operator is a binary operator, but technically the spec says "All binary [arithmetic][], [comparison][], [assignment][], [bitwise][], [logical][], [string][], and [type][]" operators need wrapping spaces. Is the pipe part of that? Unclear.
At minimum, we should add an example of a proper pipe chain (both single-line and multi-line variants).
We may also want to reword the Binary operators section in 6.2 to be a bit more complete. (And either remove the empty links or fill in links for them. WTH?)