Fixed a minor grammar mistake in ch08-01-vectors.md

[GamerPear]

Line 113 changed from "beyond the range of the vector may happen..." to "beyond the range of the vector, which may happen..."

[0xYonJuuNi]

Not a native speaker but this seems fine to me. Try reading the sentence by leaving out some parts.
"(You would use this method if) accessing an element
(beyond the range of the vector) may happen occasionally under normal
circumstances."

[GamerPear]

"You would use this method if accessing an element beyond the range of the vector," is a good, valid sentence and so is "Accessing an element beyond the range of the vector may happen occasionally under normal circumstances."

They both have the same idea of "accessing an element beyond the range of the vector", but are telling us two different things about it. The first sentence tells us that we should use "this method" when when we do it, while the second sentence tell us that doing it "may happen occasionally."

I don't remember the proper terminology for sentence composition, but since they have two separate subjects (first sentence's is us, while the second sentence's is "accessing an element ... vector") they can't be in a simple sentence and they have to be conjoined in some way. There are other ways to rewrite it than the way I did, but I just did the simplest change to make it correct.

[anthonysharpy]

I think the use of may in the original sentence makes it sound quite confusing, so I think OP is correct to point it out

You would use this method if accessing an element beyond the range of the vector may happen occasionally under normal circumstances.

I think the more natural version would be:

You would use this method if accessing an element beyond the range of the vector might happen occasionally under normal circumstances.

Or, more succinctly, maybe something like:

You would use this method if you might try to access an element beyond the range of the vector.

The use of which implies a value judgement which I don't think was intended in the original