Update What-is-FedOps-Fitbit-Health-Pipeline.md

Author: rriakang

docs/FedOps-Fitbit-Health-Pipeline/What-is-FedOps-Fitbit-Health-Pipeline.md

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 parent: FedOps Fitbit Health Pipeline
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 ## ✅ What is FedOps Fitbit Health Pipeline?
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 By applying temporal windowing to **Fitbit Health device data** (including steps, heart rate, calories, and sleep duration) and integrating it with the FedOps federated learning framework, the system enables collaborative training of an **LSTM-based** **sleep quality prediction model** across multiple devices while preserving data privacy, thus achieving automated model operations.