Commit 901e5ef

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Update topic sentence

A simple fix to better frame the difference between a transpiler and a polyfill.

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Original file line number	Diff line number	Diff line change
`@@ -23,7 +23,7 @@ Actually, there are two parts in Babel:`
`23`	`23`
`24`	`24`	`2. Second, the polyfill.`
`25`	`25`
`26`		`- New language features may include new built-in functions and syntax constructs.`
	`26`	`+ New language features may include not only syntax constructs, but also built-in functions.`
`27`	`27`	`The transpiler rewrites the code, transforming syntax constructs into older ones. But as for new built-in functions, we need to implement them. JavaScript is a highly dynamic language, scripts may add/modify any functions, so that they behave according to the modern standard.`
`28`	`28`
`29`	`29`	`A script that updates/adds new functions is called "polyfill". It "fills in" the gap and adds missing implementations.`

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