Update get_all_docstrings to return dict

[bridgetmcg]

small change to return dictionary instead of string as expect in the documentation.

Motivation and Context

This was the intended output of the function

How Has This Been Tested?

Local testing was completed using java repos.

Breaking Changes

No

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the Codellm-Devkit Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have added or updated documentation as needed

[rahlk]

Thanks for the catch! Merging to main.