cleanup, docs

site/doc/pages/hmac_sha256_hex.txt

@@ -1,10 +1,19 @@
-# hmac_sha256_hex
+:sig
+String hmac_sha256_hex(String key, String data)
 
+:params
+key : secret key
+data : message to authenticate
+return value : the HMAC-SHA256 as a 64-character lowercase hex string
 
-Returns the lowercase hexadecimal HMAC-SHA-256 digest.
+:content
+Computes an HMAC-SHA256 message authentication code and returns it as hex. Use it to sign tokens, cookies, and webhook payloads, then verify with `crypto_equal()` to avoid timing leaks.
 
 :example
-print(hmac_sha256_hex("key", "data"), "\n");
+print(hmac_sha256_hex("key", "The quick brown fox jumps over the lazy dog"), "\n");
 
 :see
->noise
+>sys
+hmac_sha256
+sha256_hex
+crypto_equal