Update specification for expand_dims, roll and reshape

Address comment in data-apisgh-85

Author: rgommers

spec/API_specification/manipulation_functions.md

@@ -39,7 +39,7 @@ Joins a sequence of arrays along an existing axis.
         ```
 
 (function-expand_dims)=
-### expand_dims(x, axis, /)
+### expand_dims(x, /, *, axis)
 
 Expands the shape of an array by inserting a new axis (dimension) of size one at the position specified by `axis`.
 
@@ -81,7 +81,7 @@ Reverses the order of elements in an array along the given axis. The shape of th
     -   an output array having the same data type and shape as `x` and whose elements, relative to `x`, are reordered.
 
 (function-reshape)=
-### reshape(x, shape, /)
+### reshape(x, /, shape)
 
 Reshapes an array without changing its data.
 
@@ -102,7 +102,7 @@ Reshapes an array without changing its data.
     -   an output array having the same data type, elements, and underlying element order as `x`.
 
 (function-roll)=
-### roll(x, shift, /, *, axis=None)
+### roll(x, /, shift, *, axis=None)
 
 Rolls array elements along a specified axis. Array elements that roll beyond the last position are re-introduced at the first position. Array elements that roll beyond the first position are re-introduced at the last position.