Update PhD student status in people.csv

Author: bowenszhu

_assets/people.csv

@@ -23,11 +23,11 @@ Theo Diamandis,PhD Student,https://github.com/tjdiamandis,Current Member,Yes
 Utkarsh,PhD Student,https://utkarsh530.github.io/,Current Member,Yes
 Valentin Churavy,PhD Student,https://vchuravy.dev,Alumni,Yes
 Axel Larsson,Visiting PhD Student,https://github.com/axla-io,Alumni,Yes
-Evelyne Ringoot,Master's Student,https://www.linkedin.com/in/evelyne-ringoot,Current Member,Yes
+Evelyne Ringoot,PhD Student,https://www.linkedin.com/in/evelyne-ringoot,Current Member,Yes
 Matthew McManus,Master's Student,,Alumni,No
 Raye Kimmerer,Master's Student,https://github.com/Wimmerer,Current Member,Yes
 Simeon Schaub,Master's Student,https://github.com/simeonschaub,Alumni,Yes
-Songchen Tan,Master's Student,https://tansongchen.mit.edu,Current Member,Yes
+Songchen Tan,PhD Student,https://tansongchen.mit.edu,Current Member,Yes
 Steven Otremba,Master's Student,https://www.linkedin.com/in/sotremba/,Alumni,Yes
 Vaibhav Dixit,Master's Student,https://www.linkedin.com/in/vaibhav-dixit-0a9739156/?originalSubdomain=in,Current Member,Yes
 Yonatan Delelegn,Master's Student,https://www.linkedin.com/in/yonatan-delelegn-102352177/,Alumni,Yes