docs(api): document hashDigest etc.

Author: chenxsan

src/content/api/loaders.mdx

@@ -389,6 +389,30 @@ module.exports = function (source) {
 };
 ```
 
+### this.hashDigest
+
+`string`
+
+The algorithm used for the hash.
+
+### this.hashDigestLength
+
+`number`
+
+The length of the hash.
+
+### this.hashFunction
+
+`string`
+
+The hash function used.
+
+### this.hashSalt
+
+`string`
+
+The salt used for the hash.
+
 ### this.importModule
 
 <Badge text="5.32.0+" />