Apostrophes in doc_markdown

[dtolnay]

pub struct Collection { /* ... */ }

/// An iterator over mycrate::Collection's values.
pub struct Iter { /* ... */ }

warning: you should put `mycrate::Collection's` between ticks in the documentation
   |
   | /// An iterator over mycrate::Collection's values.
   |                      ^^^^^^^^^^^^^^^^^^^^^
   |
   = note: #[warn(doc_markdown)] on by default
   = help: for further information visit https://rust-lang-nursery.github.io/rust-clippy/v0.0.169/index.html#doc_markdown

I would expect this to recommend `mycrate::Collection`'s instead of `mycrate::Collection's`.

[mockersf]

issue is here

let word = word.trim_matches(|c: char| !c.is_alphanumeric());