tour: add a missing period

[JSOD11]

There is a period missing at the end of a sentence in subsection 24 of the Methods and interfaces section of the tour.

Fixes golang/tour#1730

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Patch Set 1:

(1 comment)

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Message from Sean Liao:

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

(1 comment)

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Message from Go LUCI:

Patch Set 1:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2025-05-24T13:33:32Z","revision":"7c7c160177bdcb7fcd61129f2aa406327523da64"}

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Message from Sean Liao:

Patch Set 1: -Commit-Queue

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Patch Set 1:

This CL has passed the run

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Patch Set 1: LUCI-TryBot-Result+1

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Message from Dmitri Shuralyov:

Patch Set 1: Code-Review+1

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This PR is being closed because golang.org/cl/675675 has been merged.