doc: improve wording in esm.md

Simplify complex sentence. Remove use of "straightforward".

Backport-PR-URL: #32610
PR-URL: #32427
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Gus Caplan <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Trivikram Kamat <[email protected]>

Author: Trott

doc/api/esm.md

@@ -637,8 +637,8 @@ stateless):
 
 ##### Approach #2: Isolate State
 
-The most straightforward `package.json` would be one that defines the separate
-CommonJS and ES module entry points directly:
+A `package.json` file can define the separate CommonJS and ES module entry
+points directly:
 
 <!-- eslint-skip -->
 ```js