Fix sncast utils class-hash docs (#3773)

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Closes #

## Introduced changes

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-

## Checklist

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- [ ] Linked relevant issue
- [ ] Updated relevant documentation
- [ ] Added relevant tests
- [ ] Performed self-review of the code
- [ ] Added changes to `CHANGELOG.md`

Author: franciszekjob

CHANGELOG.md

@@ -68,6 +68,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - `--test-files` flag to `verify` command to include test files under src/ for verification (only applies to voyager)
 - `--tip` flag to `invoke`, `declare`, `deploy`, `multicall run` and `account deploy` commands to set the transaction tip
 - `--estimate-tip` flag which automatically adds an estimated tip to the transaction. The tip is calculated based on the current network conditions and added to the transaction fee
+- `utils class-hash` command to calculate the class hash for a contract
 
 #### Changed
 
@@ -82,12 +83,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - A bug that caused `#[fuzzer]` attribute to fail when used with generic structs
 
-### Cast
-
-#### Added
-
-- `utils class-hash` command to calculate the class hash for a contract
-
 ## [0.48.0] - 2025-08-05
 
 ### Forge

docs/src/appendix/sncast.md

@@ -21,4 +21,5 @@
 * [tx-status](./sncast/tx-status.md)
 * [utils](./sncast/utils/utils.md)
     * [serialize](./sncast/utils/serialize.md)
+    * [class-hash](./sncast/utils/class_hash.md)
 * [completions](./sncast/completions.md)

docs/src/appendix/sncast/utils/class_hash.md

@@ -1,11 +1,12 @@
-# Calculate contract class hash
+# `class-hash`
+Calculate the class hash of a contract.
 
-## Overview
-Use the `sncast utils class-hash` command to calculate the class hash of a contract.
+## `--contract-name <CONTRACT_NAME>`
+Required.
 
-## Examples
+The name of the contract. The contract name is the part after the `mod` keyword in your contract file.
 
-### General Example
+## General Example
 
 ```shell
 $ sncast utils \