gh-137696: Rename 'fort' parameter to 'order' in PyBuffer_* functions

[CarlosEduR]

This PR updates the PyBuffer_FromContiguous function by renaming the fort parameter to order for clarity. The function's declaration in the header already uses order; this change updates all references in the implementation and documentation to match.

It also updates the declaration of the PyBuffer_IsContiguous function in the header by renaming fort to order. Its documentation and definition were already using order as the parameter name.

• Issue: gh-137696

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[picnixz]

Please see https://github.com/python/cpython/issues/137696#issuecomment-3197359092 and change the functions (declarations and definitions) as well as the documentation so that all of them use 'order' instead of a mix of all. In addition, please sign the CLA.

[CarlosEduR]

Please see #137696 (comment)

Thanks for the review, @picnixz. The functions and documentation have been updated.

[nybblista]

Let's push this forward @CarlosEduR @picnixz

[CarlosEduR]

Let's push this forward @CarlosEduR @picnixz

Can you review it again, @picnixz? I just merged main into this branch again to keep it up to date.

[CarlosEduR]

Thanks for the review, @picnixz