Confusing passage in JSXV4.md

[Minnozz]

syntax/cli/JSXV4.md

Lines 216 to 225 in c840235

	### Normal Case
	```rescript
	@react.component
	let make = (~x, ~y, ~z) => body
	// is an abbreviation for
	let make = @react.component (~x, ~y, ~z) => body
	```

I believe this says the same thing twice.

[Minnozz]

Nevermind, I just understood it with the following passages that further transform the syntax.

[cristianoc]

The headers are too flat there. Adding sub headers should clarify it.

[cristianoc]

Here's a pass at clarifying the spec: #657

[Minnozz]

@cristianoc Thanks, much more clear this way!