Update Blazor binding content

[guardrex]

Fixes #20263

Internal Review Topic

Thanks @mdekok! 🚀

Let's work this further ...

• Do we want Task-return or async Task-await binding examples?

• I don't like the first sentence on Line 130. Can we do something to make it plainer/simpler?

  A common scenario is chaining a data-bound parameter to a page element in the component's output. This scenario is called a chained bind because multiple levels of binding occur simultaneously.

  How about? ...

  A common scenario is chaining a data-bound parameter of a component to a property of field of another component. This scenario is called a chained bind because multiple levels of binding occur simultaneously.

• Do I (finally 😓) have the headings right with the right examples under the right headings?

[captainsafia]

Left some thoughts to your questions inline.

[guardrex]

Excellent ... thank you @captainsafia for helping me sort this out.

WRT async Task-await (instead of Task-return), I think that's something that I'll need to update across the docs in a few other spots, so I'm going to open a separate issue and knock that out fairly fast ... probably tomorrow morning.

Thanks again @mdekok! 🌴