chore: Fix wrapping_add example code in docs

[arihantbansal]

Description

Problem*

Documentation has a slight typo wrt wrapping_add function which takes two params, x and y separately instead of the addition of the two as that would defeat the purpose of it.

Documentation*

Check one:

• No documentation needed.
• Documentation included in this PR.
• [Exceptional Case] Documentation to be submitted in a separate PR.

PR Checklist*

• I have tested the changes locally.
• I have formatted the changes with Prettier and/or cargo fmt on default settings.

[TomAFrench]

Thanks for this. LGTM

For future readers of this PR, we generally have a policy against merging "trivial" PRs against the docs due to wanting to discourage airdrop farmers sucking up the time of the core team. Despite this being a one-line change, this is an actual issue with the docs where code examples will not run so I don't think it falls under that category.