docs(examples): correct the deck's class javadoc alongside its slides

The class javadoc carried the same stale instruction the slides did - refresh
data and provenance "on the release commit" for a 2.0 asset, two releases after
2.0 shipped - and it also described the scaling iteration metadata as missing
from a "historical file" rather than as covering only one tier, which is what
the format actually does.

It now says what the slides say: read the ratios rather than the timings,
because both libraries are measured in the same run and their proportions
survive a change of machine while the milliseconds do not.

Author: DemchaAV

examples/src/main/java/com/demcha/examples/flagships/EngineDeckV2Example.java

@@ -66,9 +66,11 @@
  * <p>Benchmark wording is intentionally conservative. The bundled JSON is a
  * dated single-machine reference run without hardware or commit provenance;
  * allocation values are average thread-allocated MiB per render, not peak
- * heap, and scaling iteration metadata is absent from the historical file.
- * A final 2.0 release asset should refresh both data and provenance on the
- * release commit.</p>
+ * heap, and scaling iteration metadata covers only the small-invoice tier.
+ * Read the ratios rather than the timings: both libraries are measured in the
+ * same run, so their proportions survive a change of machine while the
+ * milliseconds do not. Refresh the data file and these figures together — see
+ * {@code docs/operations/benchmarks.md}.</p>
  *
  * @author Artem Demchyshyn
  * @since 2.0.0