chore: add spaces around slash (#1915)

Author: jay-es

src/guide/extras/reactivity-in-depth.md

@@ -67,7 +67,7 @@ This `whenDepsChange()` function has the following tasks:
 
 We can't really track the reading and writing of local variables like in the example. There's just no mechanism for doing that in vanilla JavaScript. What we **can** do though, is intercept the reading and writing of **object properties**.
 
-There are two ways of intercepting property access in JavaScript: [getter](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/get) / [setters](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/set) and [Proxies](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy). Vue 2 used getter / setters exclusively due to browser support limitations. In Vue 3, Proxies are used for reactive objects and getter/setters are used for refs. Here's some pseudo-code that illustrates how they work:
+There are two ways of intercepting property access in JavaScript: [getter](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/get) / [setters](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/set) and [Proxies](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy). Vue 2 used getter / setters exclusively due to browser support limitations. In Vue 3, Proxies are used for reactive objects and getter / setters are used for refs. Here's some pseudo-code that illustrates how they work:
 
 ```js{4,9,17,22}
 function reactive(obj) {
@@ -202,7 +202,7 @@ In fact, this is pretty close to how a Vue component keeps the state and the DOM
 
 <div class="options-api">
 
-The `ref()`, `computed()` and `watchEffect()` APIs are all part of the Composition API. If you have only been using Options API with Vue so far, you'll notice that Composition API is closer to how Vue's reactivity system works under the hood. In fact, in Vue 3 the Options API is implemented on top of the Composition API. All property access on the component instance (`this`) triggers getter/setters for reactivity tracking, and options like `watch` and `computed` invoke their Composition API equivalents internally.
+The `ref()`, `computed()` and `watchEffect()` APIs are all part of the Composition API. If you have only been using Options API with Vue so far, you'll notice that Composition API is closer to how Vue's reactivity system works under the hood. In fact, in Vue 3 the Options API is implemented on top of the Composition API. All property access on the component instance (`this`) triggers getter / setters for reactivity tracking, and options like `watch` and `computed` invoke their Composition API equivalents internally.
 
 </div>