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Minor object-rest-spread README tweaks [skip ci]

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packages/babel-plugin-proposal-object-rest-spread/README.md
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@ -54,7 +54,7 @@ require("@babel/core").transform("code", {
## Options
By default, this plugin will produce spec compliant code. The Babel's `objectSpread` helper will be used.
By default, this plugin will produce spec compliant code by using Babel's `objectSpread` helper.
### `loose`
@ -62,7 +62,7 @@ By default, this plugin will produce spec compliant code. The Babel's `objectSpr
Enabling this option will use Babel's `extends` helper, which is basically the same as `Object.assign` (see `useBuiltIns` below to use it directly).
:warning: Please take in mind that even if they're almost equivalent, there's an important difference between spread and `Object.assign`: to summarize, **spread defines new properties, while `Object.assign()` sets them**, so using this mode might produce unexpected results in some case.
:warning: Please keep in mind that even if they're almost equivalent, there's an important difference between spread and `Object.assign`: **spread _defines_ new properties, while `Object.assign()` _sets_ them**, so using this mode might produce unexpected results in some cases.
For detailed information please check out [Spread VS. Object.assign](http://2ality.com/2016/10/rest-spread-properties.html#spreading-objects-versus-objectassign) and [Assigning VS. defining properties](http://exploringjs.com/es6/ch_oop-besides-classes.html#sec_assigning-vs-defining-properties).