doc: remove non-existent entry-type flag

PR-URL: #27678
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Guy Bedford <guybedford@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

doc/api/esm.md

@@ -426,7 +426,7 @@ cache, to avoid duplication. The same object will be returned in
 CommonJS if the JSON module has already been imported from the
 same path.
 
-Assuming an `index.js` with
+Assuming an `index.mjs` with
 
 <!-- eslint-skip -->
 ```js
@@ -437,8 +437,8 @@ The `--experimental-json-modules` flag is needed for the module
 to work.
 
 ```bash
-node --experimental-modules --entry-type=module index.js # fails
-node --experimental-modules --entry-type=module --experimental-json-modules index.js # works
+node --experimental-modules index.mjs # fails
+node --experimental-modules --experimental-json-modules index.mjs # works
 ```
 
 ## Experimental Loader hooks
@@ -593,9 +593,6 @@ of these top-level routines.
 
 _isMain_ is **true** when resolving the Node.js application entry point.
 
-When using the `--entry-type` flag, it overrides the ESM_FORMAT result while
-providing errors in the case of explicit conflicts.
-
 <details>
 <summary>Resolver algorithm specification</summary>