Improve markdown docs formatting for consistency and readability

CHANGELOG.md

@@ -1,6 +1,7 @@
 ## 2023-08-03
 
 ### Optimized
+
 - Optimized PR diff processing by introducing caching for diff files, reducing the number of API calls.
 - Refactored `load_large_diff` function to generate a patch only when necessary.
 - Fixed a bug in the GitLab provider where the new file was not retrieved correctly.
@@ -8,6 +9,7 @@
 ## 2023-08-02
 
 ### Enhanced
+
 - Updated several tools in the `pr_agent` package to use commit messages in their functionality.
 - Commit messages are now retrieved and stored in the `vars` dictionary for each tool.
 - Added a section to display the commit messages in the prompts of various tools.
@@ -15,6 +17,7 @@
 ## 2023-08-01
 
 ### Enhanced
+
 - Introduced the ability to retrieve commit messages from pull requests across different git providers.
 - Implemented commit messages retrieval for GitHub and GitLab providers.
 - Updated the PR description template to include a section for commit messages if they exist.
@@ -22,10 +25,10 @@
 - Implemented this feature for both GitHub and GitLab providers.
 - Added a new configuration option 'use_repo_settings_file' to enable or disable the use of a repo-specific settings file.
 
-
 ## 2023-07-30
 
 ### Enhanced
+
 - Added the ability to modify any configuration parameter from 'configuration.toml' on-the-fly.
 - Updated the command line interface and bot commands to accept configuration changes as arguments.
 - Improved the PR agent to handle additional arguments for each action.
@@ -33,6 +36,7 @@
 ## 2023-07-28
 
 ### Improved
+
 - Enhanced error handling and logging in the GitLab provider.
 - Improved handling of inline comments and code suggestions in GitLab.
 - Fixed a bug where an additional unneeded line was added to code suggestions in GitLab.
@@ -40,6 +44,7 @@
 ## 2023-07-26
 
 ### Added
+
 - New feature for updating the CHANGELOG.md based on the contents of a PR.
 - Added support for this feature for the Github provider.
 - New configuration settings and prompts for the changelog update feature.