docs(typo): cases (#15)

Author: posva

docs/guide/using-vue.md

@@ -123,7 +123,7 @@ Make sure a custom component's names either contains a hyphen or is in PascalCas
 
 ## Script & Style Hoisting
 
-Sometimes you may need to apply some JavaScript or CSS only to the current page. In those case you can directly write root-level `<script>` or `<style>` blocks in the markdown file, and they will be hoisted out of the compiled HTML and used as the `<script>` and `<style>` blocks for the resulting Vue single-file component.
+Sometimes you may need to apply some JavaScript or CSS only to the current page. In those cases you can directly write root-level `<script>` or `<style>` blocks in the markdown file, and they will be hoisted out of the compiled HTML and used as the `<script>` and `<style>` blocks for the resulting Vue single-file component.
 
 <p class="demo" :class="$style.example"></p>