blog/slices.md: fix minor punctuation typo

[shamrin]

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Message from Ian Lance Taylor:

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

(1 comment)

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Patch Set 1:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2024-08-14T00:37:53Z","revision":"ae5b616aae518f335ac58f02642ff1f8e94679c2"}

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Message from Ian Lance Taylor:

Patch Set 1: -Commit-Queue

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Patch Set 1:

This CL has passed the run

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Message from Go LUCI:

Patch Set 1: LUCI-TryBot-Result+1

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This PR is being closed because golang.org/cl/553955 has been merged.