Bug#761338: instmodsh man page lacks command listing

[積丹尼 Dan Jacobson]

Package: perl
Version: 5.20.1~rc2-1
Severity: wishlist
File: /usr/share/man/man1/instmodsh.1.gz

Please fully list what one can do while inside this program. Compare the
cfdisk(8) man page. Allow one to make a plan of what one wants to do
before trying the program.

Also say how to use non-interactively,
e.g.,
$ echo l|instmodsh
doesn't work as expected.