_content/doc/go1.26.md: fixed typos in goroutine leak section

[VladSaiocUber]

Fixed a couple of minor typos.

[gopherbot]

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[gopherbot]

Message from Gopher Robot:

Patch Set 1:

(1 comment)

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Message from Georgian-Vlad Saioc:

Patch Set 1:

(1 comment)

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Message from Dmitri Shuralyov:

Patch Set 2: Auto-Submit+1 Code-Review+2

(1 comment)

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Message from Dmitri Shuralyov:

Patch Set 2: Code-Review+1 Commit-Queue+1

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Message from Go LUCI:

Patch Set 2:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2025-12-09T18:45:35Z","revision":"4157c02fdd264fcecb43ab95b471a2899a07e2a8"}

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Message from Dmitri Shuralyov:

Patch Set 2: -Commit-Queue

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Message from Go LUCI:

Patch Set 2:

This CL has passed the run

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Message from Go LUCI:

Patch Set 2: LUCI-TryBot-Result+1

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This PR is being closed because golang.org/cl/728620 has been merged.