Clarify the behavior of Add... integration extension methods and contrast them with With... methods #4736
Description
Describe the issue or suggestion
Integrations extension methods conform to this pattern:
- With... These methods configures the object and returns the original object.
- Add... These methods add a new child object and returns the new child.
Devs may find the Add methods' behavior unexpected. For example: https://discordapp.com/channels/1361488941836140614/1417232708731404318
Add a new section to the Integrations Overview article to clarify this.