fix: remove ex6

one_md_per_day_format/piscine/Week3/w3day03.md

@@ -241,8 +241,4 @@ model.add(Dense(3, activation='softmax'))
 # Compile model
 model.compile(loss='categorical_crossentropy', optimizer='adam', metrics=['accuracy'])
 model.fit(X_train_sc, y_train_multi_class, epochs = 1000, batch_size=20)
-```
-
-# Exercise 6 GridSearch
-
-https://medium.com/@am.benatmane/keras-hyperparameter-tuning-using-sklearn-pipelines-grid-search-with-cross-validation-ccfc74b0ce9f
+```