Fix SIMD article: correct loop logic, grammar, and style

[Copilot]

The SIMD example had a loop condition bug (i < left.Length) that caused the "remaining items" loop to never execute — the first loop would consume all elements, leaving nothing for the scalar remainder pass.

The English docs already carry the correct fix using a remaining pre-calculation:

int remaining = length % Vector<double>.Count;

for (int i = 0; i < length - remaining; i += Vector<double>.Count)
{
    // process complete vector-sized chunks
}

for (int i = length - remaining; i < length; i++)
{
    // scalar tail: processes leftover elements
}

Additional fixes

• Grammar: "SIMD-enable types" → "SIMD-enabled types" in the description frontmatter
• Heading capitalization: "Simple Vectors" → "Simple vectors" (sentence case)
• Frontmatter: updated ms.date and added ai-usage: ai-assisted

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Error in SIMD example</issue_title>
<issue_description>---
Issue moved from dotnet/docs.fr-fr#118

• Please respond to @polijp.

---

From @polijp on Friday, November 6, 2020 8:37:34 PM

Dear all, I guess the example on this page is not correct, or I'm missing something:
for (i = 0; i < left.Length; i += offset)
{
var v1 = new Vector(left, i);
var v2 = new Vector(right, i);
(v1 * v2).CopyTo(result, i);
}

//remaining items
for (; i < left.Length; ++i)
{
    result[i] = left[i] * right[i];
}

if you exit the first loop, it means that i>=left. length, so the second loop will have no iteration.
Or obviously, some data must be processed there.

---

Détails du document

⚠ Ne pas modifier cette section. C’est obligatoire pour docs.microsoft.com ➟ Liaison des problèmes GitHub.

• ID: 9e0f3c8a-1548-40cd-1688-d574c0d1db1d
• Version Independent ID: 40f9283e-0200-4398-7dc3-00c2bca59e81
• Content: Types accélérés SIMD dans .NET
• Content Source: docs/standard/simd.md
• Product: dotnet
• Technology: dotnet-standard
• GitHub Login: @FIVIL
• Microsoft Alias: tagoo</issue_description>

Comments on the Issue (you are @copilot in this section)

@gewarren --- **Issue moved from dotnet/docs.fr-fr#118** - Please respond to @polijp.

---

From @polijp on Friday, November 6, 2020 8:44:19 PM

To me the first loop should look like:
for (i = 0; i <= left.Length - offset; i += offset)
{
var v1 = new Vector(left, i);
var v2 = new Vector(right, i);
(v1 * v2).CopyTo(result, i);
}</comment_new>

• Fixes Error in SIMD example #21609

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Internal previews

📄 File	🔗 Preview link
docs/standard/simd.md	docs/standard/simd

[BillWagner]

This LGTM, and the original bus was already fixed in the English version.

[Copilot]

Pull request overview

Updates the SIMD documentation page metadata and heading capitalization to align with current docs conventions and disclose AI assistance.

Changes:

• Fixed a typo in the frontmatter description (“SIMD-enable” → “SIMD-enabled”).
• Updated ms.date to 03/17/2026 and added ai-usage: ai-assisted to the frontmatter.
• Changed the “Simple Vectors” heading to sentence case (“Simple vectors”).