A few doc updates.

[ci skip]

Author: thedodd

CHANGELOG.md

@@ -2,7 +2,7 @@ changelog
 =========
 
 ## 0.7
-Minimal changes per this release. The main issue being addressed here is [#20](https://github.com/thedodd/wither/issues/20). It is arguable that this is just a bug fix, but the interface for `Model.update` has changed enough with these updates, that a minor version increment is merited.
+Minimal changes per this release. The main issue being addressed here is [#20](https://github.com/thedodd/wither/issues/20). It is arguable that this is just a bug fix, but the interface for `Model.update` has changed enough with these updates that a minor version increment is merited.
 
 The main thing to observe here is that `Model.update` now takes an optional filter document. If none is given, then this method will create a filter doc and populate it with the model's ID. If a doc is given, then it will have the `_id` key set (potentially overwritten) to the model's ID. Lastly, this method now returns `Result<Option<Self>>` to reflect the fallible nature of the update with a filter.
 

wither/src/model.rs

@@ -301,8 +301,7 @@ pub trait Model<'a> where Self: Serialize + Deserialize<'a> {
             }
         };
 
-        // Perform a FindOneAndUpdate operation on this model's document by ID. Will fail if this
-        // model instance was never saved to the database to begin with.
+        // Perform a FindOneAndUpdate operation on this model's document by ID.
         coll.find_one_and_update(filter, update, Some(options)).and_then(|docopt| match docopt {
             Some(doc) => match Self::instance_from_document(doc) {
                 Ok(model) => Ok(Some(model)),