doc: unhide resolver spec

PR-URL: #35358
Reviewed-By: Myles Borins <myles.borins@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

Author: guybedford

doc/api/esm.md

@@ -949,8 +949,7 @@ The resolver can throw the following errors:
 * _Package Import Not Defined_: Package imports do not define the specifier.
 * _Module Not Found_: The package or module requested does not exist.
 
-<details>
-<summary>Resolver algorithm specification</summary>
+### Resolver Algorithm Specification
 
 **ESM_RESOLVE**(_specifier_, _parentURL_)
 
@@ -1204,8 +1203,6 @@ _internal_, _conditions_)
 >    1. Throw an _Invalid Package Configuration_ error.
 > 1. Return the parsed JSON source of the file at _pjsonURL_.
 
-</details>
-
 ### Customizing ESM specifier resolution algorithm
 
 The current specifier resolution does not support all default behavior of