Grammar: Fix "it's" vs "its" in several places (#2518)

examples/README.md

@@ -4,4 +4,4 @@ This folder contains numerous examples showing how to use axum. Each example is
 setup as its own crate so its dependencies are clear.
 
 For a list of what the community built with axum, please see the list
-[here](../ECOSYSTEM.md).
+[here](../ECOSYSTEM.md).

examples/low-level-openssl/src/main.rs

@@ -73,7 +73,7 @@ async fn main() {
             // `TokioIo` converts between them.
             let stream = TokioIo::new(tls_stream);
 
-            // Hyper has also its own `Service` trait and doesn't use tower. We can use
+            // Hyper also has its own `Service` trait and doesn't use tower. We can use
             // `hyper::service::service_fn` to create a hyper `Service` that calls our app through
             // `tower::Service::call`.
             let hyper_service = hyper::service::service_fn(move |request: Request<Incoming>| {

examples/low-level-rustls/src/main.rs

@@ -68,7 +68,7 @@ async fn main() {
             // `TokioIo` converts between them.
             let stream = TokioIo::new(stream);
 
-            // Hyper has also its own `Service` trait and doesn't use tower. We can use
+            // Hyper also has its own `Service` trait and doesn't use tower. We can use
             // `hyper::service::service_fn` to create a hyper `Service` that calls our app through
             // `tower::Service::call`.
             let hyper_service = hyper::service::service_fn(move |request: Request<Incoming>| {

examples/serve-with-hyper/src/main.rs

@@ -6,7 +6,7 @@
 //!
 //! This example shows how to run axum using hyper's low level API.
 //!
-//! The [hyper-util] crate exists to provide high level utilities but its still in early stages of
+//! The [hyper-util] crate exists to provide high level utilities but it's still in early stages of
 //! development.
 //!
 //! [hyper-util]: https://crates.io/crates/hyper-util