Updated download.md page for one download jar instead of two

[sameerz]

Description

Made the following documentation changes:

1. Our download documentation refers to an outdated cudf jar requiring installation. Updating download.md to remove that second reference.
2. Replaced the long name for the product with the short name after the first reference.
3. Documentation mentions the CUDA toolkit needs to be installed. It does not, since it is bundled with the jar. Instead, mention the NVIDIA driver.

Checklists

• This PR has added documentation for new or modified features or behaviors.
• This PR has added new tests or modified existing tests to cover new code paths.
  (Please explain in the PR description how the new code paths are tested, such as names of the new/existing tests that cover them.)
• Performance testing has been performed and its results are added in the PR description. Or, an issue has been filed with a link in the PR description.

[greptile-apps]

Greptile Summary

This PR updates docs/download.md to reflect the current single-jar distribution model and corrects two outdated installation prerequisites.

• Removes the reference to the separate RAPIDS cuDF jar; users now only need the rapids-4-spark plugin jar.
• Replaces the CUDA toolkit installation requirement with the NVIDIA driver, since CUDA is bundled in the jar.
• Introduces "RAPIDS Spark" as a short-form abbreviation after the first full product name reference, reducing verbosity.
• Fixes the capitalisation of "for" in the full product name ("For" → "for") and adds a trailing newline at the end of the file.
• One minor wording inconsistency remains: "the RAPIDS Spark" on line 17 uses an article inconsistently compared to the rest of the paragraph; dropping "the" is suggested.

Confidence Score: 5/5

• Documentation-only change with accurate, low-risk corrections; safe to merge.
• All three stated goals (single-jar, driver vs. CUDA toolkit, short-form name) are correctly implemented. The only finding is a trivial article-usage nit that does not affect accuracy or correctness.
• No files require special attention.

Important Files Changed

Filename	Overview
docs/download.md	Documentation-only update: removes the outdated two-jar installation requirement, replaces the CUDA toolkit prerequisite with the NVIDIA driver, and introduces "RAPIDS Spark" as a short-form name; one minor article-usage inconsistency ("the RAPIDS Spark") flagged.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Worker Node Setup] --> B{NVIDIA GPU present?}
    B -- No --> C[Cannot use RAPIDS Spark]
    B -- Yes --> D[Install NVIDIA Driver R525+]
    D --> E[Deploy rapids-4-spark plugin jar]
    E --> F{Deployment method}
    F -- Preinstalled --> G[Add jar to Spark classpath on all nodes]
    F -- Per-job --> H[Submit jar with each Spark job]
    G --> I[RAPIDS Spark ready]
    H --> I

Loading

_{Last reviewed commit: a0588e9}

[greptile-apps]

Awkward article before product short name

The phrase "that uses the RAPIDS Spark" reads unnaturally — "the" before a proper noun used as a product abbreviation is grammatically awkward here, and the same paragraph introduces the name without an article on line 16 ("RAPIDS Spark consists of…"). Dropping "the" improves consistency and flow.

Suggested change

	classpath on all nodes or submitted with each job that uses the RAPIDS Spark. See the
	classpath on all nodes or submitted with each job that uses RAPIDS Spark. See the

_{Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!}

[nvauto]

NOTE: release/26.04 has been created from main. Please retarget your PR to release/26.04 if it should be included in the release.

[nvliyuan]

LGTM

[revans2]

Do we want to upmerge this?

[nvauto]

NOTE: release/26.06 has been created from main. Please retarget your PR to release/26.06 if it should be included in the release.