Improve as suggested by Nikos

Author: dalito

CONTRIBUTING.md

@@ -6,7 +6,7 @@ Thank you for your interest in contributing to the Voc4Cat vocabulary! This SKOS
 
 1. **Download** the current vocabulary Excel file: [voc4cat.xlsx](https://nfdi4cat.github.io/voc4cat/dev/voc4cat.xlsx)
 2. **Edit** the Excel file to add/modify concepts
-3. **Request ID range** (for new concepts): [Create an issue](https://github.com/nfdi4cat/voc4cat/issues/new/choose)
+3. **Request a range of IDs** (for new concepts): [Create an issue](https://github.com/nfdi4cat/voc4cat/issues/new/choose)
 4. **Submit** your Excel file in a pull request:
    - Place file in `inbox-excel-vocabs/` folder
    - Keep the filename as `voc4cat.xlsx`
@@ -25,7 +25,7 @@ For detailed guidelines and step-by-step instructions, see:
 
 - **[Current Vocabulary Guidelines](https://nfdi4cat.github.io/voc4cat/docs_usage/guidelines.html)**
 - **[Step-by-step Guide (PDF)](https://zenodo.org/records/13757351)** - Visual walkthrough of the process
-- **[Vocabulary Guidelines V2.0](https://doi.org/10.5281/zenodo.13773255)** - Academic publication on Zenodo
+- **[Vocabulary Guidelines V2.1](https://doi.org/10.5281/zenodo.15006962)** - Publication on Zenodo (as printed)
 
 ## What Happens Next?