Incorrect documentation on try_lock_exclusive

[tcharding]

I think the docs are wrong here, should be 'Locks the file for exclusive usage, or returns a an error if the file is currently locked (see lock_contended_error).'

fn try_lock_exclusive(&self) -> Result<()>
[−]
Locks the file for shared usage, or returns a an error if the file is currently locked (see lock_contended_error).

https://tantivy-search.github.io/tantivy/fs2/trait.FileExt.html#tymethod.try_lock_exclusive