Docs: replace an unreproducible dsv4 bind-phase baseline

[ChaoWao]

Summary

docs/dfx/hbg-bind-phases.md corrects two rows of its pinned table — dsv4's
args and host_view_close — in a paragraph that tells the reader what to
expect on a current tree. Both of its figures were unusable for that:

• The baseline was f830f13c3 plus a then-uncommitted child-memory change,
  so it cannot be reproduced from any commit in the tree.
• host_view_close was measured before Fix: prefer staging views for host tensor access #1973 removed the halHostRegister
  side, leaving it an order of magnitude high. A reader A/B-ing against
  0.014–0.028 ms today reads a 10x regression where there is none.

Both now come from the merged tree at dcf7559e8, 12 binds over two ranks at
--rounds 6: args 0.036–0.075 ms, host_view_close 0.0012–0.0030 ms with
count=0 bytes=0. #2022 established that giving a phase's counters the span its
clock covers changes what the numbers mean and not their values, so these remain
the current figures and were not re-measured on top of it.

Peak host RSS is recorded beside them, because the rows being corrected are
per-byte costs over what a bind stages: 1.31 GiB across the whole process
tree under --skip-golden and 23.4 GiB when the fixture is streamed in,
against the ~45.5 GB per rank the pinned row cost. That also retires the local
note that dsv4 was SIGKILLed at --rounds 6 — both modes now complete six
rounds with exit 0.

The pinned table itself is untouched. It is anchored to 777d4171 on
purpose and says so ("For orientation, not thresholds … Re-measure rather than
trusting this table"), so refreshing its rows would work against its intent.
Only the paragraph that speaks for the current tree is changed.

Testing

• markdownlint-cli2 --config tests/lint/.markdownlint.yaml — 0 errors
• tests/lint/check_retired_names.py — clean
• Figures measured on dcf7559e8 via the doc's own recipe, two arms,
  task-submit --device auto --device-num 2, 12 binds each

Docs-only; no code path is touched.

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Reviewing files that changed from the base of the PR and between f40cacf and 8c67082.

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• docs/dfx/hbg-bind-phases.md

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