Update fx_graph_mode_quant_guide.rst

Small fix

Author: Svetlana Karslioglu

prototype_source/fx_graph_mode_quant_guide.rst

@@ -169,13 +169,9 @@ after:
       return x.permute(0, 2, 1, 3)
 
 
-quantization code:
-
 This can be combined with other approaches and the quantization code
 depends on the model.
 
-
-
 Write your own observed and quantized submodule
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