_content/ref/mod: adding a toolchain directive only applies to Go <= 1.24

[leonklingele]

Since Go 1.25 this is no longer the case.
See also https://go.dev/doc/go1.25#go-command.

For golang/go#65847

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Patch Set 1:

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Patch Set 1:

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Patch Set 2: Commit-Queue+1

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Patch Set 2:

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Patch Set 2: -Commit-Queue

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Patch Set 2: LUCI-TryBot-Result+1

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Patch Set 3: Auto-Submit+1 Code-Review+2

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Patch Set 3:

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Message from Sean Liao:

Patch Set 4: Code-Review+2 Commit-Queue+1

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Patch Set 4:

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Patch Set 4: -Commit-Queue

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Patch Set 4:

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Patch Set 4: -Code-Review

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