Fix typo 'inetria' to 'inertia'

doc/base/classes.xml

@@ -32449,7 +32449,7 @@
 			<description>
 			</description>
 		</method>
-		<method name="get_principal_inetria_axes" qualifiers="const">
+		<method name="get_principal_inertia_axes" qualifiers="const">
 			<return type="Basis">
 			</return>
 			<description>

servers/physics_server.cpp

@@ -75,7 +75,7 @@ void PhysicsDirectBodyState::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("get_total_angular_damp"), &PhysicsDirectBodyState::get_total_angular_damp);
 
 	ClassDB::bind_method(D_METHOD("get_center_of_mass"), &PhysicsDirectBodyState::get_center_of_mass);
-	ClassDB::bind_method(D_METHOD("get_principal_inetria_axes"), &PhysicsDirectBodyState::get_principal_inertia_axes);
+	ClassDB::bind_method(D_METHOD("get_principal_inertia_axes"), &PhysicsDirectBodyState::get_principal_inertia_axes);
 
 	ClassDB::bind_method(D_METHOD("get_inverse_mass"), &PhysicsDirectBodyState::get_inverse_mass);
 	ClassDB::bind_method(D_METHOD("get_inverse_inertia"), &PhysicsDirectBodyState::get_inverse_inertia);