Documentation typo fixes (#4500)

* Minor typo fix for CLI Service docs page

In the last paragraph of the CLI Service docs page the second instance of the word 'need' should be changed to 'needs'.

* Typo fix to 'HTML and Static Assets' docs page

Author: owanhunte

docs/guide/cli-service.md

@@ -179,4 +179,4 @@ When installed, `@vue/cli-service` also installs [yorkie](https://github.com/yyx
 
 Projects created via `vue create` are ready to go without the need for additional configuration. The plugins are designed to work with one another so in most cases, all you need to do is pick the features you want during the interactive prompts.
 
-However, we also understand that it's impossible to cater to every possible need, and the need of a project may also change over time. Projects created by Vue CLI allow you to configure almost every aspect of the tooling without ever needing to eject. Check out the [Config Reference](../config/) for more details.
+However, we also understand that it's impossible to cater to every possible need, and the needs of a project may also change over time. Projects created by Vue CLI allow you to configure almost every aspect of the tooling without ever needing to eject. Check out the [Config Reference](../config/) for more details.

docs/guide/html-and-static-assets.md

@@ -72,7 +72,7 @@ import(/* webpackPrefetch: true */ './someAsyncComponent.vue')
 webpack's runtime will inject prefetch links when the parent chunk is loaded.
 
 ::: tip
-Prefetch links will consume bandwidth. If you have a large app with many async chunks and your user are primarily mobile and thus bandwidth-aware, you may want to disable prefetch links and manually select chunks to prefetch.
+Prefetch links will consume bandwidth. If you have a large app with many async chunks and your users are primarily mobile and thus bandwidth-aware, you may want to disable prefetch links and manually select chunks to prefetch.
 :::
 
 ### Disable Index Generation