fix documentation typos

Handbook/src/appendix/planned-features-completion-status.md

@@ -26,7 +26,7 @@
 - [X] Easy wrist/hand tracking debugging using the SenseGlove Debug module.
 - [X] A generic Settings module with the ability to override settings.
 - [X] C++/Blueprint interaction events such as OnGrabStateUpdated, OnTouchStateUpdated, OnActorGrabbed, OnActorReleased, OnActorBeginTouch, and OnActorEndTouch.
-- [X] A fallback to HMD and wrist tracker hardware auto-detection mechanism when automatic detection of the wrist tracker hardware is desired.
+- [X] A fall back to HMD and wrist tracker hardware auto-detection mechanism when automatic detection of the wrist tracker hardware is desired.
 - [X] OpenXR-compatible hand tracking (XR_EXT_hand_tracking) support.
 - [X] FXRMotionControllerData compatible hand animation system.
 - [X] FXRMotionControllerData compatible wrist tracking system.
@@ -43,7 +43,7 @@
 
 - [ ] Get tracking input from sources other than a SenseGlove device.
 - [ ] Be able to assign behaviors to different objects (meshes) in the scene (e.g. Slider, Hinge, basic Grabables, etc).
-- [ ] Make it so developers can define or extend their own behavior(s) to an object through Code / Blueprints (e.g. I want a car door that is like a slider, but follows a path rather than a straight line).
+- [ ] Make it so developers can define or extend their own behavior(s) to an object through Code / Blueprint (e.g. I want a car door that is like a slider, but follows a path rather than a straight line).
 - [ ] Make the hand(s) able to push around physics-driven objects (for as much as their behaviors allow) (in backlog).
 - [ ] Be able to grab objects with up to 2 hands (and move them around with both hands at the same time in a way that seems realistic).
 - [ ] Ensure that our virtual hands (and the objects they hold) do not phase through other physics objects (e.g. walls and tables).