Fix some grammatical errors in the docs (bevyengine#6109)

Co-authored-by: devil-ira <justthecooldude@gmail.com>

crates/bevy_hierarchy/src/events.rs

@@ -1,28 +1,27 @@
 use bevy_ecs::prelude::Entity;
 
-/// A [`Event`] that is fired whenever there is a change in the world's
-/// hierarchy.
+/// An [`Event`] that is fired whenever there is a change in the world's hierarchy.
 ///
 /// [`Event`]: bevy_ecs::event::Event
 #[derive(Debug, Clone)]
 pub enum HierarchyEvent {
-    /// Fired whenever an [`Entity`] is added as a child to a new parent.
+    /// Fired whenever an [`Entity`] is added as a child to a parent.
     ChildAdded {
-        /// The child that added
+        /// The child that was added
         child: Entity,
         /// The parent the child was added to
         parent: Entity,
     },
-    /// Fired whenever an child [`Entity`] is removed from is parent.
+    /// Fired whenever a child [`Entity`] is removed from its parent.
     ChildRemoved {
-        /// The child that removed
+        /// The child that was removed
         child: Entity,
         /// The parent the child was removed from
         parent: Entity,
     },
-    /// Fired whenever an child [`Entity`] is moved to a new parent.
+    /// Fired whenever a child [`Entity`] is moved to a new parent.
     ChildMoved {
-        /// The child that moved
+        /// The child that was moved
         child: Entity,
         /// The parent the child was removed from
         previous_parent: Entity,

crates/bevy_time/src/stopwatch.rs

@@ -58,8 +58,8 @@ impl Stopwatch {
     ///
     /// # See Also
     ///
-    /// [`elapsed_secs`](Stopwatch::elapsed_secs) - if a `f32` value is desirable instead.
-    /// [`elapsed_secs_f64`](Stopwatch::elapsed_secs_f64) - if a `f64` is desirable instead.
+    /// [`elapsed_secs`](Stopwatch::elapsed_secs) - if an `f32` value is desirable instead.
+    /// [`elapsed_secs_f64`](Stopwatch::elapsed_secs_f64) - if an `f64` is desirable instead.
     #[inline]
     pub fn elapsed(&self) -> Duration {
         self.elapsed
@@ -80,7 +80,7 @@ impl Stopwatch {
     /// # See Also
     ///
     /// [`elapsed`](Stopwatch::elapsed) - if a `Duration` is desirable instead.
-    /// [`elapsed_secs_f64`](Stopwatch::elapsed_secs_f64) - if a `f64` is desirable instead.
+    /// [`elapsed_secs_f64`](Stopwatch::elapsed_secs_f64) - if an `f64` is desirable instead.
     #[inline]
     pub fn elapsed_secs(&self) -> f32 {
         self.elapsed().as_secs_f32()
@@ -92,7 +92,7 @@ impl Stopwatch {
     /// # See Also
     ///
     /// [`elapsed`](Stopwatch::elapsed) - if a `Duration` is desirable instead.
-    /// [`elapsed_secs`](Stopwatch::elapsed_secs) - if a `f32` is desirable instead.
+    /// [`elapsed_secs`](Stopwatch::elapsed_secs) - if an `f32` is desirable instead.
     #[inline]
     pub fn elapsed_secs_f64(&self) -> f64 {
         self.elapsed().as_secs_f64()

crates/bevy_time/src/timer.rs

@@ -98,7 +98,7 @@ impl Timer {
         self.stopwatch.elapsed()
     }
 
-    /// Returns the time elapsed on the timer as a `f32`.
+    /// Returns the time elapsed on the timer as an `f32`.
     /// See also [`Timer::elapsed`](Timer::elapsed).
     #[inline]
     pub fn elapsed_secs(&self) -> f32 {

docs/profiling.md

@@ -2,7 +2,7 @@
 
 ## Runtime Flame Graph: `tracing` spans
 
-Bevy has built-in [tracing](https://github.com/tokio-rs/tracing) spans to make it cheap and easy to profile Bevy ECS systems, render logic, engine iternals, and user app code. Enable the `trace` cargo feature to enable Bevy's built-in spans.
+Bevy has built-in [tracing](https://github.com/tokio-rs/tracing) spans to make it cheap and easy to profile Bevy ECS systems, render logic, engine internals, and user app code. Enable the `trace` cargo feature to enable Bevy's built-in spans.
 
 If you also want to include `wgpu` tracing spans when profiling, they are emitted at the `tracing` `info` level so you will need to make sure they are not filtered out by the `LogSettings` resource's `filter` member which defaults to `wgpu=error`. You can do this by setting the `RUST_LOG=info` environment variable when running your application.