erts: update erl_cmd.md docs with new time warp default

[jpjodoin]

multi_time_warp has been the default mode since OTP 26, but no_time_warp was still marked as the default in the doc.

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CT Test Results

    3 files    135 suites   49m 34s ⏱️ 1 649 tests 1 592 ✅ 57 💤 0 ❌ 2 285 runs  2 209 ✅ 76 💤 0 ❌

Results for commit 89b509ba.

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// Erlang/OTP Github Action Bot

[rickard-green]

Thanks for the fix. I've rebased it so we can include it in patches instead of merging it into master where it would not show up until OTP 29.