chore: Fix inaccurate documentation

Author: pierluigiferrari

ssd300_training.ipynb

@@ -163,9 +163,9 @@
     "\n",
     "model.load_weights(weights_path, by_name=True)\n",
     "\n",
-    "# 3: Instantiate an Adam optimizer and the SSD loss function and compile the model.\n",
-    "#    If you want to follow the original Caffe implementation, use the SGD optimizer\n",
-    "#    that is commented out instead of the Adam optimizer.\n",
+    "# 3: Instantiate an optimizer and the SSD loss function and compile the model.\n",
+    "#    If you want to follow the original Caffe implementation, use the preset SGD\n",
+    "#    optimizer, otherwise I'd recommend the commented-out Adam optimizer.\n",
     "\n",
     "#adam = Adam(lr=0.001, beta_1=0.9, beta_2=0.999, epsilon=1e-08, decay=0.0)\n",
     "sgd = SGD(lr=0.001, momentum=0.9, decay=0.0, nesterov=False)\n",
@@ -425,7 +425,7 @@
    "source": [
     "# Define model callbacks.\n",
     "\n",
-    "# TODO: Set the filepath under which you want to save the weights.\n",
+    "# TODO: Set the filepath under which you want to save the model.\n",
     "model_checkpoint = ModelCheckpoint(filepath='ssd300_pascal_07+12_epoch-{epoch:02d}_loss-{loss:.4f}_val_loss-{val_loss:.4f}.h5',\n",
     "                                   monitor='val_loss',\n",
     "                                   verbose=1,\n",