Fixed multiple to allowMultiple in documentation. was not setting op…

[chas688]

…tion, whereas is working.

1️⃣ Is this something that is wanted/needed? Did you create an issue / discussion about it first?

2️⃣ Does it contain multiple, unrelated changes? Please separate the PRs out.

3️⃣ Does it include tests, if possible? (Not a deal-breaker, just a nice-to-have)

4️⃣ Please include a thorough description of the improvement and reasons why it's useful.

5️⃣ Thanks for contributing! 🙌

[rawilk]

Thanks for fixing that. Merging now.