Fix some typos. (#620)

src/dynamics/rigid_body.rs

@@ -443,7 +443,7 @@ impl RigidBody {
         self.ccd.ccd_enabled = enabled;
     }
 
-    /// Is CCD (continous collision-detection) enabled for this rigid-body?
+    /// Is CCD (continuous collision-detection) enabled for this rigid-body?
     pub fn is_ccd_enabled(&self) -> bool {
         self.ccd.ccd_enabled
     }

src/dynamics/rigid_body_components.rs

@@ -595,7 +595,7 @@ impl RigidBodyVelocity {
     }
 
     /// Integrate the velocities in `self` to compute obtain new positions when moving from the given
-    /// inital position `init_pos`.
+    /// initial position `init_pos`.
     #[must_use]
     pub fn integrate(
         &self,

src/dynamics/rigid_body_set.rs

@@ -209,7 +209,7 @@ impl RigidBodySet {
     /// Update colliders positions after rigid-bodies moved.
     ///
     /// When a rigid-body moves, the positions of the colliders attached to it need to be updated.
-    /// This update is generally automatically done at the beggining and the end of each simulation
+    /// This update is generally automatically done at the beginning and the end of each simulation
     /// step with `PhysicsPipeline::step`. If the positions need to be updated without running a
     /// simulation step (for example when using the `QueryPipeline` alone), this method can be called
     /// manually.  

src/dynamics/solver/solver_constraints_set.rs

@@ -96,7 +96,7 @@ impl<Constraints: ConstraintTypes> SolverConstraintsSet<Constraints> {
         }
     }
 
-    #[allow(dead_code)] // Useful for debuging.
+    #[allow(dead_code)] // Useful for debugging.
     pub fn print_counts(&self) {
         println!("Solver constraints:");
         println!(