Removed capital letter in parameter in stdtypes.rst (GH-17218)

Automerge-Triggered-By: @csabella

Doc/library/stdtypes.rst

@@ -3667,7 +3667,7 @@ copying.
       :mod:`struct` module syntax.
 
       .. versionadded:: 3.8
-         *Order* can be {'C', 'F', 'A'}.  When *order* is 'C' or 'F', the data
+         *order* can be {'C', 'F', 'A'}.  When *order* is 'C' or 'F', the data
          of the original array is converted to C or Fortran order. For contiguous
          views, 'A' returns an exact copy of the physical memory. In particular,
          in-memory Fortran order is preserved. For non-contiguous views, the