The `[dependencies]` sample in the top level should be marked as toml

So someone clearly didn't want the `[dependencies]` example entry to be a rustdoc test, which is correct and all, but instead of marking the block as `ignore` (which makes the rustdoc highlight it with a spooky warning) you should mark it as being `toml`, which which prevent rustdoc from trying to look inside the block and marking it as spooky untested code.

So, just replace

\`\`\`.ignore
[dependencies]
nalgebra = "0.17"
\`\`\`

With

\`\`\`toml
[dependencies]
nalgebra = "0.17"
\`\`\`