Unclear documentation for mdbook test -L

[finegeometer]

After reading your documentation, I was led to an incorrect understanding of how to use the --library-path option for mdbook test.

What it says:

The --library-path (-L) option allows you to add directories to the library
search path used by rustdoc when it builds and tests the examples. Multiple
directories can be specified with multiple options (-L foo -L bar) or with a
comma-delimited list (-L foo,bar).

What I thought it meant:

Pass the cargo workspace as an argument. (e.g. -L project/)

What it actually meant:

Pass the compilation artifacts as an argument. (e.g. -L project/target/debug/deps/)

How I found out what it actually meant:

• I looked through the code, until I determined that it repasses the argument to rustdoc.
• I looked at the rustdoc guide, which contained an example that corrected my misconception.

It looks like the person who wrote this issue had the same misconception that I did.