docs: improve changelog by adding examples (#251)

### What Changed?
This PR adds examples to the `Added` and `Breaking changes` of the last
released version (0.1.3).

### Reviewer Checklist

- [ ] New features are tested and documented
- [ ] PR updates the changelog with a description of changes
- [ ] PR has one of the `changelog-X` labels (if applies)
- [ ] Code deprecates any old functionality before removing it

---------

Co-authored-by: Pablo Deymonnaz <pdeymon@fi.uba.ar>
Co-authored-by: Tomás Grüner <47506558+MegaRedHand@users.noreply.github.com>

Author: 3 people

CHANGELOG.md

@@ -7,7 +7,9 @@ Changelog is present since v0.1.2
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-Each version will have a separate `Breaking Changes` section as well. To describe in how to upgrade from one version to another if needed
+Each version will have a separate `Breaking Changes` section as well. To describe in how to upgrade from one version to another if needed.
+
+Those changes in added, changed or breaking changes, should include usage examples to add clarity to the sdk user.
 
 ## [Unreleased]
 ### Added
@@ -36,19 +38,82 @@ Each version will have a separate `Breaking Changes` section as well. To describ
 * feat: add rewards-v2 related functionality by @supernovahs in https://github.com/Layr-Labs/eigensdk-rs/pull/221
   * New methods in `ELChainReader`:
     * `get_operator_avs_split`
+    ```rust
+    // Given a chain_reader, an operator_address and an avs_address:
+
+    let split = el_chain_reader
+        .get_operator_avs_split(operator_address, avs_address)
+        .await
+        .unwrap();
+    ```
+    
     * `get_operator_pi_split`
+    ```rust
+    // Given a chain_reader and an operator_address:
+
+    let split = el_chain_writer
+        .el_chain_reader
+        .get_operator_pi_split(operator_address)
+        .await
+        .unwrap();
+    ```
+
   * New methods in `ELChainWriter`:
     * `set_operator_avs_split`
+    ```rust
+    // Given a chain_writer, an operator_address, an avs_address and a split:
+
+    let tx_hash = el_chain_writer
+        .set_operator_avs_split(operator_address, avs_address, split)
+        .await
+        .unwrap();
+    let receipt = wait_transaction(&http_endpoint, tx_hash).await.unwrap();
+    ```
     * `set_operator_pi_split`
+    ```rust
+    // Given a chain_writer, an operator_address and a split:
+
+    let tx_hash = el_chain_writer
+        .set_operator_pi_split(operator, split)
+        .await
+        .unwrap();
+    let receipt = wait_transaction(&http_endpoint, tx_hash).await.unwrap();
+    ```
   * Bindings updated for rewards-v2 core contracts release
 
 ### Breaking Changes 🛠
 * feat!: remove delegation manager from `ELChainWriter` by @supernovahs in https://github.com/Layr-Labs/eigensdk-rs/pull/214
   * `ELChainWriter::new` no longer receives the delegation manager address as first parameter.
+    Before, a chainWriter was created this way:
+
+    ```rust
+        let el_writer = ELChainWriter::new(
+            DELEGATION_MANAGER_ADDRESS,
+            STRATEGY_MANAGER_ADDRESS,
+            REWARDS_COORDINATOR,
+            el_chain_reader,
+            "https://ethereum-holesky.blockpi.network/v1/rpc/public".to_string(),
+            "bead471191bea97fc3aeac36c9d74c895e8a6242602e144e43152f96219e96e8".to_string(),
+        );
+    ```
+
+    Now, the creation is done without the delegation manager address:
+
+    ```rust
+        let el_writer = ELChainWriter::new(
+            STRATEGY_MANAGER_ADDRESS,
+            REWARDS_COORDINATOR,
+            el_chain_reader,
+            "<https://ethereum-holesky.blockpi.network/v1/rpc/public>".to_string(),
+            "bead471191bea97fc3aeac36c9d74c895e8a6242602e144e43152f96219e96e8".to_string(),
+        );
+    ```
 * feat!: change way bindings are generated by @MegaRedHand in https://github.com/Layr-Labs/eigensdk-rs/pull/204
   * `eigen_utils::core` contains bindings related to core contracts
   * `eigen_utils::middleware` contains bindings related to middleware contracts
   * `eigen_utils::sdk` contains bindings related to the SDK (should only be used for testing)
+  
+  Now, to update the bindings, run `make bindings`. This command will generate the bindings files in the folder: `crates/utils`.
 
 ### Documentation 📚
 * docs: add CHANGELOG.md by @lferrigno in https://github.com/Layr-Labs/eigensdk-rs/pull/220