runtime: update documentation for ios addr bits

[lycodestore]

After this merge: https://go-review.googlesource.com/c/go/+/344401, ios/arm64 was treated as a 64 bit system and the addr bits of ios/arm64 was set to 40

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Message from 吴光耀:

Patch Set 1:

(1 comment)

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Message from Keith Randall:

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

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Message from Go LUCI:

Patch Set 1:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2024-09-09T16:15:30Z","revision":"cc13d669555a6adfbf80f15f6c615e2dbb0ebcf3"}

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Message from Keith Randall:

Patch Set 1: Code-Review+1

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Message from Keith Randall:

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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This PR is being closed because golang.org/cl/610856 has been merged.