fix typo in documentation

schema/cpacs_schema.xsd

@@ -9104,16 +9104,16 @@ [email protected]
                                 the hinge line, which is a straight line between the two points.
                             </ddue:para>
                             <ddue:para>The deflection path of the control surface is defined
-                                within the hinge line coordinat system. This is defined as
+                                within the hinge line coordinate system. This is defined as
                                 follows: The x-hinge coordinate equals the wing x-axis. The
                                 y-hinge coordinate equals the hinge line axis (see above;
                                 positive from inner to outer hinge point). The z-hinge line is
                                 perpendicular on the x-hinge and y-hinge coordinate according to
                                 the right hand rule. The rotation of the control surface is
                                 defined as rotation around the positive y-hinge line.
                             </ddue:para>
-                            <ddue:para>The deflection of the is defined in any number of
-                                steps. The deflection of the control surface is done as follows:
+                            <ddue:para>The deflection of the control surface is defined by at 
+                                least two steps. It is specified as follows:
                                 First the x-deflection at the inner and outer border; afterwards
                                 the z-deflection of the inner and outer border; last the
                                 y-deflection of the inner border. The y-deflection is only
@@ -9354,16 +9354,16 @@ [email protected]
                     <ddue:remarks>
                         <ddue:content>
                             <ddue:para>The deflection path of the control surface is defined
-                                within the hinge line coordinat system. This is defined as
+                                within the hinge line coordinate system. This is defined as
                                 follows: The x-hinge coordinate equals the wing x-axis. The
                                 y-hinge coordinate equals the hinge line axis (see above;
                                 positive from inner to outer hinge point). The z-hinge line is
                                 perpendicular on the x-hinge and y-hinge coordinate according to
                                 the right hand rule. The rotation of the control surface is
                                 defined as rotation around the positive y-hinge line.
                             </ddue:para>
-                            <ddue:para>The deflection of the is defined in any number of
-                                steps. The deflection of the control surface is done as follows:
+                            <ddue:para>The deflection of the control surface is defined by at 
+                                least two steps. It is specified as follows:
                                 First the x-deflection at the inner and outer border; afterwards
                                 the z-deflection of the inner and outer border; last the
                                 y-deflection of the inner border. The y-deflection is only