In the section that starts with “The algorithm as a whole is:”, you do not have an explicit step that updates the weights & biases. The needed formulas are in a section above, where you wrote that “CD = 0 – n” and “W’ = W + alpha*CD”. Copying those two lines into the list of steps for the algorithm would make the algorithm a bit clearer, I think.

Next, on the diagrams, it might be helpful to explicitly label the blue nodes as visible nodes & the brown nodes as hidden nodes.

Also, when you say, “Si.Sj is just a multiplication of current activation (state) of neuron I and neuron J” it might be slightly clearer to explicitly say that Si is the state of a visible neuron, and Sj is the state of a hidden neuron. This becomes more obvious later on, but at that point in the text one might think Si & Sj could be the states of two different neurons in the same layer, which they’re not.