docs: consist usage of in-DOM template (#2521)

Author: jay-es

src/guide/components/registration.md

@@ -136,6 +136,6 @@ Throughout the guide, we are using PascalCase names when registering components.
 
 2. `<PascalCase />` makes it more obvious that this is a Vue component instead of a native HTML element in templates. It also differentiates Vue components from custom elements (web components).
 
-This is the recommended style when working with SFC or string templates. However, as discussed in [in-DOM Template Parsing Caveats](/guide/essentials/component-basics#in-dom-template-parsing-caveats), PascalCase tags are not usable in DOM templates.
+This is the recommended style when working with SFC or string templates. However, as discussed in [in-DOM Template Parsing Caveats](/guide/essentials/component-basics#in-dom-template-parsing-caveats), PascalCase tags are not usable in in-DOM templates.
 
 Luckily, Vue supports resolving kebab-case tags to components registered using PascalCase. This means a component registered as `MyComponent` can be referenced in the template via both `<MyComponent>` and `<my-component>`. This allows us to use the same JavaScript component registration code regardless of template source.

src/style-guide/rules-strongly-recommended.md

@@ -352,7 +352,7 @@ Unfortunately, HTML doesn't allow custom elements to be self-closing - only [off
 ```
 
 ```vue-html
-<!-- In DOM templates -->
+<!-- In in-DOM templates -->
 <my-component/>
 ```
 
@@ -367,7 +367,7 @@ Unfortunately, HTML doesn't allow custom elements to be self-closing - only [off
 ```
 
 ```vue-html
-<!-- In DOM templates -->
+<!-- In in-DOM templates -->
 <my-component></my-component>
 ```