Standardize Comments

[FauziAkram]

Comments improvement, mainly, I've noticed a mix of comment styles in our chess engine code: double slashes (//) and triple slashes (///). To enhance code consistency and readability, I propose we standardize on double slashes (//) for comments for better consistency and clarity.
Non-Functional change.

[vondele]

I believe the two vs. three slashes has to do with the scope or visibility of the functions that are being commented (maybe somebody can explain).

I don't have particularly strong opinion of that one, it has not been particularly useful for me, but maybe others like this.

[Disservin]

A somewhat more useful change for modern ide's is to move the comment above the function directly above the function without an empty line between so that ide's can properly display the description when hovered over. I think that is kinda required by all ide's (a topic/pr on it's own).

Regarding the triple slashes vs double slashes I find it rather weird and not clear on first sight, so I'm fine with enforcing double slashes throughout the code.

[vondele]

so let's remove the blank line between comments and functions as part of this PR as well. It makes sense to have good IDE integration. @FauziAkram can you do that?

[FauziAkram]

@vondele Unfortunately, I'm afraid I can't do it for now.
I just hope this PR gets accepted, and then maybe in the future, I will come back to it if nobody touched it.