Update README.md

src/notebooks/README.md

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 Directory contains the Jupyter notebooks for analyzing the heart failure prediction dataset.
 
-### 1. Data Cleaning (`01_data_cleaning_heart_failure.ipynb`)
+### 1. Data Cleaning (`data_cleaning_heart_failure.ipynb`)
 - Initial data loading and inspection
 - Data cleaning steps:
   - Removed records with invalid Cholesterol (0)
   - Removed records with invalid RestingBP (0)
   - Reduced dataset from 918 to 746 records
 
-### 2. Data Visualization (`02_data_visualization.ipynb`)
+### 2. Data Visualization (`data_visualization.ipynb`)
 - Uses cleaned data from notebook 1
 - Created visualizations:
   - Age distribution by heart disease status
   - Correlation heatmap of key features
   - Gender distribution analysis
-- Saved visualizations to `data/figures/`
+- Saved visualizations to `data/figures/`