docs: correct JSDoc on Workflow.poll and WorkflowEngine.poll

[biboete]

Fixes #2336.

The poll method only polls the current status of a workflow execution; it does not execute the workflow. The JSDoc summary lines were copy-pasted from the neighbouring execute blocks and therefore described execution behaviour incorrectly.

This corrects the two summary lines:

• packages/effect/src/unstable/workflow/Workflow.ts: the block above readonly poll: now reads "Poll the current status of a workflow execution." instead of "Execute the workflow with the given payload."
• packages/effect/src/unstable/workflow/WorkflowEngine.ts: the block above readonly poll: now reads "Poll the current status of a registered workflow execution." instead of "Execute a registered workflow."

The correct execute JSDoc blocks in both files are left untouched.

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Latest commit: 6bb33b6

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Bundle Size Analysis

File Name	Current Size	Previous Size	Difference
basic.ts	6.72 KB	6.47 KB	+0.25 KB (+3.83%)
batching.ts	9.23 KB	8.98 KB	+0.25 KB (+2.74%)
brand.ts	6.19 KB	6.14 KB	+0.05 KB (+0.85%)
cache.ts	9.70 KB	9.67 KB	+0.03 KB (+0.34%)
config.ts	18.39 KB	18.52 KB	-0.13 KB (-0.70%)
differ.ts	16.86 KB	17.01 KB	-0.15 KB (-0.91%)
http-client.ts	20.20 KB	20.17 KB	+0.03 KB (+0.17%)
logger.ts	10.18 KB	9.97 KB	+0.22 KB (+2.19%)
metric.ts	8.56 KB	8.32 KB	+0.24 KB (+2.88%)
optic.ts	7.37 KB	7.35 KB	+0.02 KB (+0.24%)
pubsub.ts	13.80 KB	13.76 KB	+0.04 KB (+0.30%)
queue.ts	11.08 KB	10.85 KB	+0.23 KB (+2.16%)
schedule.ts	10.08 KB	10.04 KB	+0.04 KB (+0.40%)
schema-representation-roundtrip.ts	26.27 KB	26.47 KB	-0.20 KB (-0.76%)
schema-string-transformation.ts	12.59 KB	12.67 KB	-0.08 KB (-0.64%)
schema-string.ts	10.34 KB	10.42 KB	-0.08 KB (-0.78%)
schema-template-literal.ts	13.94 KB	14.04 KB	-0.10 KB (-0.72%)
schema-toArbitraryLazy.ts	20.54 KB	20.68 KB	-0.14 KB (-0.69%)
schema-toCodeDocument.ts	21.12 KB	21.25 KB	-0.13 KB (-0.61%)
schema-toCodecJson.ts	17.67 KB	17.84 KB	-0.17 KB (-0.95%)
schema-toEquivalence.ts	17.60 KB	17.73 KB	-0.13 KB (-0.74%)
schema-toFormatter.ts	17.43 KB	17.58 KB	-0.15 KB (-0.86%)
schema-toJsonSchemaDocument.ts	19.96 KB	20.09 KB	-0.13 KB (-0.67%)
schema-toRepresentation.ts	17.99 KB	18.15 KB	-0.15 KB (-0.85%)
schema.ts	17.03 KB	17.18 KB	-0.15 KB (-0.86%)
stm.ts	11.95 KB	11.72 KB	+0.23 KB (+1.98%)
stream.ts	9.25 KB	9.10 KB	+0.15 KB (+1.60%)