Tiny grammar and spelling fixes. (actix#122)

Author: nieksand

examples/ping.rs

@@ -17,7 +17,7 @@ struct MyActor {
     count: usize,
 }
 
-/// Declare actor and it's context
+/// Declare actor and its context
 impl Actor for MyActor {
     type Context = Context<Self>;
 }

src/actor.rs

@@ -101,7 +101,7 @@ pub trait Actor: Sized + 'static {
     /// fn main() {
     ///     // initialize system
     ///     System::run(|| {
-    ///         let addr = MyActor.start(); // <- start actor and get it's address
+    ///         let addr = MyActor.start(); // <- start actor and get its address
     /// #       System::current().stop();
     ///     });
     /// }

src/arbiter.rs

@@ -27,7 +27,7 @@ thread_local!(
 
 /// Event loop controller
 ///
-/// Arbiter controls event loop in it's thread. Each arbiter runs in separate
+/// Arbiter controls event loop in its thread. Each arbiter runs in separate
 /// thread. Arbiter provides several api for event loop access. Each arbiter
 /// can belongs to specific `System` actor.
 ///

src/registry.rs

@@ -29,7 +29,7 @@ type AnyMap = HashMap<TypeId, Box<Any>, BuildHasherDefault<FnvHasher>>;
 /// `ArbiterService` which is unique per arbiter or `SystemService` which is
 /// unique per system.
 ///
-/// If arbiter service is used outside of runnig arbiter, it panics.
+/// If arbiter service is used outside of running arbiter, it panics.
 ///
 /// # Example
 ///
@@ -96,7 +96,7 @@ pub struct Registry {
 /// Trait defines arbiter's service.
 #[allow(unused_variables)]
 pub trait ArbiterService: Actor<Context = Context<Self>> + Supervised + Default {
-    /// Construct and srtart arbiter service
+    /// Construct and start arbiter service
     fn start_service() -> Addr<Self> {
         Supervisor::start(|ctx| {
             let mut act = Self::default();
@@ -222,7 +222,7 @@ type InnerRegistry = Arc<ReentrantMutex<RefCell<AnyMapSend>>>;
 /// Trait defines system's service.
 #[allow(unused_variables)]
 pub trait SystemService: Actor<Context = Context<Self>> + Supervised + Default {
-    /// Construct and srtart system service
+    /// Construct and start system service
     fn start_service(sys: &Addr<Arbiter>) -> Addr<Self> {
         Supervisor::start_in_arbiter(sys, |ctx| {
             let mut act = Self::default();