Fix interpolated selector :extend example

[Hashim1999164]

Summary

• Corrects the Selector Interpolation with Extend example that used @{variable}:extend(.bucket) {}, which does not extend the resolved selector.
• Documents the working nested &:extend form and notes the non-working attached form.
• Fixes less/less.js#4326.

Test plan

• Compared both forms with lessc 4.8.0: attached :extend on @{variable} does not add .selector; nested &:extend does.
• Confirm the updated example renders correctly on lesscss.org after docs deploy.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 5b587e6f-70c9-4d9e-b2ee-a784e919839e

📥 Commits

Reviewing files that changed from the base of the PR and between b5d22e8 and 75d8150.

📒 Files selected for processing (1)

• content/features/extend.md

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📝 Walkthrough

Walkthrough

The documentation for selector interpolation with extend now shows &:extend(.bucket) nested inside the interpolated selector block. It updates the Less example and compiled CSS output, and explicitly states that @{variable}:extend(.bucket) {} does not currently extend the interpolated selector.

Estimated code review effort: 1 (Trivial) | ~3 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the docs fix for the interpolated selector :extend example.
Description check	✅ Passed	The description matches the documentation change and references the linked issue accurately.
Linked Issues check	✅ Passed	The updated example uses nested &:extend and documents the correct compiled CSS and late interpolation behavior.
Out of Scope Changes check	✅ Passed	The change appears limited to the requested documentation fix with no unrelated edits.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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