cleanup, docs

site/doc/pages/sha256_hex.txt

@@ -1,10 +1,18 @@
-# sha256_hex
+:sig
+String sha256_hex(String data)
 
+:params
+data : bytes to hash
+return value : the SHA-256 digest as a 64-character lowercase hex string
 
-Returns the lowercase hexadecimal SHA-256 digest for `data`.
+:content
+Returns the SHA-256 digest of `data` as hex text. Use it for checksums, cache keys, and content fingerprints where you want a printable digest. For the raw 32-byte digest use `sha256()`.
 
 :example
-print(sha256_hex("hello"), "\n");
+print(sha256_hex("abc"), "\n");
 
 :see
->noise
+>sys
+sha256
+hmac_sha256_hex
+gen_sha1