[style] Review style around " and ``

[mmcky]

Review the style around " and ticks across the lecture to make sure it is consistent.

As can be seen in the screenshot we need to fix the use of double single quotes instead of proper quotation.

For example,

``it is thrown into the ocean''

should be

"it is thrown into the ocean"

[bishmaybarik]

Hi @mmcky, quick question:

Does this issue belong to a specific lecture, or should we check through all of them?

Thanks! :-)