FIX: update readme for PiW to add link for preproc pres

Author: mnoergaard

PET-Is-Wonderful2025/README.md

@@ -5,6 +5,6 @@ The [PET is wonderful 2025 Meeting](https://petiswonderful.org/) was held from t
 Two sessions of the educational part of the conference were presented by OpenNeuroPET members:
 
 * Melanie talked about "[PET data formats: past history and current resources](https://raw.githubusercontent.com/openneuropet/outreach/main/PET-Is-Wonderful2025/PETisWonderful2025_Ganz.pdf)"
-* Martin introduced the audience to "Containerizing pre-processing tools for clinical PET"
+* Martin introduced the audience to "[Containerizing pre-processing tools for clinical PET](https://raw.githubusercontent.com/openneuropet/outreach/main/pet_is_wonderful_preprocessing_Norgaard.pdf)"
 
 Both talks can be found below and were also recorded and will be distributed through the PET is wonderful website.