docs: update the contributing guide

Signed-off-by: Mukul Kolpe <mukulkolpe45@gmail.com>

CONTRIBUTING.md

@@ -24,7 +24,7 @@ New to our project? [Make your first contribution](#your-first-code-contribution
 - Ensure you follow our [style guides](#style-guides) for code and documentation.
 - Write [tests](https://doc.rust-lang.org/cargo/commands/cargo-test.html). Ensure they all pass (`cargo test --workspace`).
 - Perform pre-commit routine like formatting & artifacts regeneration (see [`pre-commit.sample`](./hooks/pre-commit.sample))
-- With the `upstream` set to track [Hyperledger Iroha repository](https://github.com/hyperledger/iroha), `git pull -r upstream main`, `git commit -s`, `git push <your-fork>`, and [create a pull request](https://github.com/hyperledger/iroha/compare) to the `main` branch. Ensure the PR has the `type: Description` [title](#pull-request-titles).
+- With the `upstream` set to track [Hyperledger Iroha repository](https://github.com/hyperledger/iroha), `git pull -r upstream main`, `git commit -s`, `git push <your-fork>`, and [create a pull request](https://github.com/hyperledger/iroha/compare) to the `main` branch. Ensure the PR has the `<type>: <description>` [title](#pull-request-titles).
 
 ### Reporting Bugs
 
@@ -92,7 +92,11 @@ If you intend to implement the suggestion yourself, do the following:
 3. When you are ready to open a pull request, make sure you follow the [pull request guidelines](#pull-request-etiquette) and mark it as implementing the previously created issue:
 
    ```
-   feat: Description
+   feat: Description of the feature
+
+   Explanation of the feature
+
+   Closes #1234
    ```
 
 4. If your change requires an API change, use the `api-changes` tag.
@@ -215,7 +219,7 @@ Follow these commit guidelines:
 
   You may use [the `commit-msg` hook](./hooks/) to automatically sign-off your commits.
 
-- Follow the same naming schema as for [pull request titles](#pull-request-titles): `type: Description`. This means:
+- Follow the same naming schema as for [pull request titles](#pull-request-titles): `<type>: <description>`. This means:
   - **Use present tense** ("Add feature", not "Added feature")
   - **Use imperative mood** ("Deploy to docker..." not "Deploys to docker...")
 - Write a meaningful commit message.