text/template: add an if func example

[linsite]

Updates #13880

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Patch Set 1:

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Patch Set 7:

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Message from Ian Lance Taylor:

Patch Set 8: Commit-Queue+1

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Patch Set 8:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2025-03-06T01:54:04Z","revision":"1dbab3897e879021e2092a002902151989c0d850"}

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Message from Ian Lance Taylor:

Patch Set 8: -Commit-Queue

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Patch Set 8:

This CL has passed the run

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Message from Go LUCI:

Patch Set 8: LUCI-TryBot-Result+1

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