Replace some "uncommon" words in class reference

[Mickeon]

Over time some very "exotic" words have seeped through the class reference. This is not very good because the assumption is that non-native English speakers should be able to read the documentation, as well.

When it can be done, it's better to be consistent. Broad terms and less common words relative to the rest of the class reference should be avoided.

This PR may seem big, but don't be fooled. Most of these words can only be found twice at most across the class reference, anyway. Some typos on the way are fixed, as well.

The most notable replacements include:

• "Untouched" -> "Unaffected", "Unchanged";
• "standalone" -> "independent";
• "Fine" -> "Good", "Precise" (depending on context);
• "Notwithstanding" -> "Regardless of"; _{what the heck, guys? I had to look up this one, too!}
• "Disregards" -> "Ignores";
• "Neglects to" -> "Fails to";

[AThousandShips]

Looks good otherwise

[YuriSizov]

Other than that, seems like a nice cleanup!

[Mickeon]

Thank you @AThousandShips and @YuriSizov for taking your time looking at this!

[akien-mga]

Thanks!

[YuriSizov]

Cherry-picked for 4.2.2.