docs(content): update content

Author: ThornWalli

docs/src/composables/use-content-container.md

@@ -35,7 +35,7 @@ const { currentTag } = useContentContainer();
 ## Types
 
 ```ts
-function useContentContainer(options?: ContentContainerOptions): ContentContainerReturn;
+declare function useContentContainer(options?: ContentContainerOptions): ContentContainerReturn;
 
 declare interface ContentContainerOptions {
   tag?: string;

docs/src/composables/use-content-headline.md

@@ -36,7 +36,7 @@ const { currentTag } = useContentHeadline();
 ## Types
 
 ```ts
-function useContentHeadline(options?: ContentHeadlineOptions): ContentHeadlineReturn;
+declare function useContentHeadline(options?: ContentHeadlineOptions): ContentHeadlineReturn;
 
 declare interface ContentHeadlineOptions {
   tag?: string;