Fix minor typos

tutorials/physics/kinematic_character_2d.rst

@@ -13,7 +13,7 @@ responses). Many attempts were made to create a character controller
 using the dynamics engines but it wasn't as easy as it seems. Godot
 has one of the best implementations of dynamic character controller
 you can find (as it can be seen in the 2d/platformer demo), but using
-it requieres a considerable level of skill and understanding of
+it requires a considerable level of skill and understanding of
 physics engines (or a lot of patience with trial and error).
 
 Some physics engines such as Havok seem to swear by dynamic character

tutorials/physics/using_kinematic_body_2d.rst

@@ -8,7 +8,7 @@ Introduction
 
 Godot offers a number of collision objects to provide both collision detection
 and response. Trying to decide which one to use for your project can be confusing.
-You can avoid problems and simplify development if you understand how each each
+You can avoid problems and simplify development if you understand how each of them
 works and what their pros and cons are. In this tutorial, we'll look at the
 :ref:`KinematicBody2D <class_KinematicBody2D>` node and show some examples
 of how it can be used.