Clarify warning in conditional statement

[kevaundray]

Problem

Here we state a warning, that the code snippet needs to be ran at the start of main, but there is no explanation as to why.

Solution

Speaking with Guillaume he noted:

If you move this snippet, it will still work but it will not be a regression anymore (i.e it will also work without the fix)

So the solution is to expand on the comment for future developers.

Alternatives considered

(Describe any alternative solutions you have considered.)

Additional context

(If applicable.)

[kevaundray]

Closing this and tracking the general issue here: #1938