Fix misleading XML documentation for pairwise functions

[Copilot]

The XML documentation for the pairwise function in the List, Array, and Seq modules was unclear about the order of elements in the returned pairs. The original documentation did not explicitly state which element comes first in each pair, which could lead to confusion.

This PR clarifies the documentation by explicitly stating that "the predecessor comes first in the returned pairs" in all three module interfaces:

• src/FSharp.Core/list.fsi
• src/FSharp.Core/array.fsi
• src/FSharp.Core/seq.fsi

The change is documentation-only and doesn't affect any code behavior. The examples in the documentation already correctly showed the ordering, but the summary text needed to be more explicit for developers using IDE tool tips.

Before:

/// <summary>Returns a list of each element in the input list and its predecessor, with the
/// exception of the first element which is only returned as the predecessor of the second element.</summary>

After:

/// <summary>Returns a list of each element in the input list paired with its predecessor, with the
/// exception of the first element which is only returned as the predecessor of the second element.
/// The predecessor comes first in the returned pairs.</summary>

Fixes #17052.

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