Fix developer documentation link and macOS spelling

Updated the link format for developer documentation and corrected 'MacOS' to 'macOS'.

Author: ReboreExplore

README.md

@@ -84,9 +84,9 @@ For more information on how to use the package, please refer to the [documentati
 
 The documentation includes:
 - [Data Organization](docs/data_organization.md): Guidelines for organizing the data in a BIDS compliant manner.
-- [Developer Documentation]([docs/developer_documentation.md](https://www.s-ccs.de/LSLAutoBIDS/)): Information about the internal functionality of the tool, how to contribute, and how to extend the package. (Will be there soon.)
+- [Developer Documentation](https://www.s-ccs.de/LSLAutoBIDS/): Information about the internal functionality of the tool, how to contribute, and how to extend the package.
 
 
 ## Disclaimer
-The package is still in development and currently is only supported in MacOS and Linux. 
+The package is still in development and is currently only supported in macOS and Linux.