Little sparse grammar corrections of comments - tutorials

[AleDinve]

Hi! Given that I'm reading all the tutorials, I would like to adjust some grammar typos on the .ipynb descriptions or comments.

E.g.:

• Tutorial 1: Introduction: "..we will solve a simple Ordinary Differential Equation (ODE) problem busing using the PINN solver."
• Tutorial 1: Generate Data, 2nd example: #..through latin hypercube samping sampling in D..

[dario-coscia]

Hi! Thank you for opening the issue. Are you going to address all the tutorials? I assign the issue to you :)

[AleDinve]

I've revised all the tutorials and corrected comments and Markdown sections