doc lei blob: avoid combined description of separate options
The next commit will update the manpages to split each option's
variants into separate items. This change won't mix well with
--oid-a, --path-a, and --path-b. These different options all share a
single description, and, if each form is on its own line, the link
between the variants of each option would no longer be clear.
Use a dedicated description for each option to avoid confusion.