[GH-2617] Reorder raster function signatures

[omribz156]

Did you read the Contributor Guide?

• Yes, I have read the Contributor Rules and Contributor Development Guide

Is this PR related to a ticket?

• Yes, and the PR name follows the format [GH-XXX] my subject. Closes docs: Rearrange order of function headers in Raster Operation docs to be more intuitive #2617

What changes were proposed in this PR?

This reorders raster function format signatures from the shortest form to the longest form, so optional parameters are introduced progressively.

The patch keeps the change docs-only and updates the raster operator/band accessor pages where the reversed ordering still existed.

How was this patch tested?

• git diff --check
• Static format-block check that the changed RS_* signatures are ordered by increasing argument count

Did this PR include necessary documentation updates?

• Yes, I have updated the documentation.

This was implemented with Codex assistance, with the final diff reviewed before posting.

[jiayuasu]

Thank you!