Docs: Arguments are described in the reverse order for map_or and map_or_else

[lefth]

Result and Option have map_or and map_or_else functions. In each case, the first parameter is used when the struct contains no value (or contains an error), while the second parameter is used when there is a value in the struct. The documentation mentions there parameters in the reverse order. This is confusing, as programmers expect parameter names to be documented in order.

I suggest reversing the wording.

I'll be submitting a PR with the change. If there are other classes or functions that have this issue, please leave a comment and I will change them as well.

[jyn514]

Fixed in #84609.