Fix several issues in Document.currentScript (#20852)

- make `import.meta` as a code
- use `HTMLScriptElement` instead of `<script>`

files/en-us/web/api/document/currentscript/index.md

@@ -13,15 +13,15 @@ browser-compat: api.Document.currentScript
 
 {{APIRef("DOM")}}
 
-The **`Document.currentScript`** property returns the {{HTMLElement("script")}} element whose script is currently being processed and [isn't a JavaScript module](https://github.com/whatwg/html/issues/997). (For modules use [import.meta](/en-US/docs/Web/JavaScript/Reference/Operators/import.meta) instead.)
+The **`Document.currentScript`** property returns the {{HTMLElement("script")}} element whose script is currently being processed and [isn't a JavaScript module](https://github.com/whatwg/html/issues/997). (For modules use [`import.meta`](/en-US/docs/Web/JavaScript/Reference/Operators/import.meta) instead.)
 
 It's important to note that this will not reference the {{HTMLElement("script")}}
 element if the code in the script is being called as a callback or event handler; it
 will only reference the element while it's initially being processed.
 
 ## Value
 
-A {{HTMLElement("script")}} or null.
+A {{domxref("HTMLScriptElement")}} or null.
 
 ## Examples
 
@@ -47,7 +47,7 @@ if (document.currentScript.async) {
 
 ## See also
 
-- [import.meta](/en-US/docs/Web/JavaScript/Reference/Operators/import.meta)
+- [`import.meta`](/en-US/docs/Web/JavaScript/Reference/Operators/import.meta)
 - {{HTMLElement("script")}}
 - {{DOMxRef("document.afterscriptexecute_event")}}
 - {{DOMxRef("document.beforescriptexecute_event")}}