Chart: in the description of the argument coord_restrictions, replace…

… all instances of 'restrictions' by 'coord_restrictions'

src/sage/manifolds/chart.py

@@ -87,15 +87,16 @@ class Chart(UniqueRepresentation, SageObject):
     - ``coord_restrictions``: Additional restrictions on the coordinates.
       A restriction can be any symbolic equality or inequality involving
       the coordinates, such as ``x > y`` or ``x^2 + y^2 != 0``. The items
-      of the list (or set or frozenset) ``restrictions`` are combined
+      of the list (or set or frozenset) ``coord_restrictions`` are combined
       with the ``and`` operator; if some restrictions are to be combined with
       the ``or`` operator instead, they have to be passed as a tuple in some
-      single item of the list (or set or frozenset) ``restrictions``. For example::
+      single item of the list (or set or frozenset) ``coord_restrictions``.
+      For example::
 
         coord_restrictions=[x > y, (x != 0, y != 0), z^2 < x]
 
       means ``(x > y) and ((x != 0) or (y != 0)) and (z^2 < x)``.
-      If the list ``restrictions`` contains only one item, this
+      If the list ``coord_restrictions`` contains only one item, this
       item can be passed as such, i.e. writing ``x > y`` instead
       of the single element list ``[x > y]``.  If the chart variables have
       not been declared as variables yet, ``coord_restrictions`` must