chore: improve keccak256 docstring and update changelog (hiero-ledger#1862)

Signed-off-by: Geesha <141132370+GeeshaN2001@users.noreply.github.com>
Signed-off-by: exploreriii <133720349+exploreriii@users.noreply.github.com>
Co-authored-by: exploreriii <133720349+exploreriii@users.noreply.github.com>

Author: GeeshaN2001

CHANGELOG.md

@@ -23,6 +23,7 @@ This changelog is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.
 ### Src
 - Fix `TopicInfo.__str__()` to format `expiration_time` in UTC so unit tests pass in non-UTC environments. (#1800)
 - Resolve CodeQL `reflected-XSS` warning in TCK JSON-RPC endpoint
+- Improve `keccak256` docstring formatting for better readability and consistency (#1624)
 
 ### Examples
 - Refactor `examples/file/file_create_transaction.py` to remove `os`,`dotenv`,`AccountId`,`PrivateKey`,`Network` imports that are no longer needed and updated setup-client() (#1610)

src/hiero_sdk_python/utils/crypto_utils.py

@@ -17,8 +17,20 @@
 
 def keccak256(data: bytes) -> bytes:
     """
-    Mirroring the Java code's `Crypto.calcKeccak256`.
+    Compute the Keccak-256 hash of the input data.
+
+    This mirrors the Java SDK's `Crypto.calcKeccak256` function.
+
+    Args:
+        data: The bytes to hash.
+
+    Returns:
+        bytes: The 32-byte Keccak-256 hash digest.
+
+    Raises:
+        RuntimeError: If pycryptodome or similar keccak library is not installed.
     """
+
     global keccak
     if keccak is None:
         raise RuntimeError("Keccak not available. Install pycryptodome or similar.")