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

axum-extra/src/json_lines.rs

@@ -55,7 +55,7 @@ pin_project! {
     ///     JsonLines::new(stream_of_values()).into_response()
     /// }
     /// ```
-    // we use `AsExtractor` as the default because you're more likely to name this type if its used
+    // we use `AsExtractor` as the default because you're more likely to name this type if it's used
     // as an extractor
     #[must_use]
     pub struct JsonLines<S, T = AsExtractor> {

axum-extra/src/routing/typed.rs

@@ -321,7 +321,7 @@ where
 /// Utility trait used with [`RouterExt`] to ensure the second element of a tuple type is a
 /// given type.
 ///
-/// If you see it in type errors its most likely because the second argument to your handler doesn't
+/// If you see it in type errors it's most likely because the second argument to your handler doesn't
 /// implement [`TypedPath`].
 ///
 /// You normally shouldn't have to use this trait directly.