Update README.md

README.md

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 ## Model Architecture
 - **Embedding Layer**: Converts input text into dense vectors.
 - **CNN Layers**: Extracts features from text sequences.
-- **RNN, LSTM, and GRU Layers**: Capture temporal dependencies in text.
+- **Vanilla RNN, LSTM**: Capture temporal dependencies in text.
 - **Dense Layers**: Classify text into sentiment categories.
 
 ## Usage