Fixing typos and spelling in comments.

src/installed.rs

@@ -240,7 +240,7 @@ impl<'c, FD: 'static + FlowDelegate + Clone + Send, C: 'c + hyper::client::conne
                     .then(|r| {
                         match r {
                             Ok(Some(mut code)) => {
-                                // Partial backwards compatibilty in case an implementation adds a new line
+                                // Partial backwards compatibility in case an implementation adds a new line
                                 // due to previous behaviour.
                                 let ends_with_newline =
                                     code.chars().last().map(|c| c == '\n').unwrap_or(false);

src/lib.rs

@@ -8,7 +8,7 @@
 //! # Device Flow Usage
 //! As the `DeviceFlow` involves polling, the `DeviceFlowHelper` should be used
 //! as means to adhere to the protocol, and remain resilient to all kinds of errors
-//! that can occour on the way.
+//! that can occur on the way.
 //!
 //! # Service account "flow"
 //! When using service account credentials, no user interaction is required. The access token

src/refresh.rs

@@ -9,7 +9,7 @@ use hyper::header;
 use serde_json as json;
 use url::form_urlencoded;
 
-/// Implements the [Outh2 Refresh Token Flow](https://developers.google.com/youtube/v3/guides/authentication#devices).
+/// Implements the [OAuth2 Refresh Token Flow](https://developers.google.com/youtube/v3/guides/authentication#devices).
 ///
 /// Refresh an expired access token, as obtained by any other authentication flow.
 /// This flow is useful when your `Token` is expired and allows to obtain a new