Fix typo in message ID generation section

[mjd507]

No description provided.

[mjd507]

I have a doubt

The idGenerator field in MessageHeaders looks always null, and no static setIdGenerator method provided.

but the static getGenerator method will check this null idGenerator first, then the default-idGenerator.

I see in spring integration, our IdGeneratorConfigurer will use reflection to set this idGenerator field.

is it intentional, what's the harm if we add a static setIdGenerator method.

[artembilan]

what's the harm if we add a static setIdGenerator method.

That is totally different story from what you have just fixed here.
I cannot answer you to that question because that was done before me.
You can raise a GH issue in the https://github.com/spring-projects/spring-framework with that question and proposal.
Doesn't look like it really comes with the harm: if we can do that via reflection, that means users of the framework can do that, too.