Update knottedtree123.md (#2888)

* Update knottedtree123.md

* Format dates section in KyryloFilonenko.md

Author: rct225

_fellows/2025/KyryloFilonenko.md

@@ -7,10 +7,10 @@ fellow-name: "Kyrylo Filonenko"
 title: "Kyrylo Filonenko - IRIS-HEP Fellow"
 active: True
 dates:
-  start: 2025-07-01
-  end: 2025-09-23
-  start: 2026-07-06
-  end: 2026-09-28
+  - start: 2025-07-01
+    end: 2025-09-23
+  - start: 2026-07-06
+    end: 2026-09-28
 photo: "/assets/images/team/fellows-2025/Kyrylo-Filonenko.jpg"
 institution: "Taras Shevchenko National University of Kyiv"
 e-mail: "ababagalamagat1@gmail.com"

_fellows/2025/knottedtree123.md

@@ -7,10 +7,10 @@ fellow-name: Cody Tanner
 title: Cody Tanner - IRIS-HEP Fellow
 active: True
 dates:
-  start: 2025-07-01
-  end: 2025-09-26
-  start: 2026-06-15
-  end: 2026-09-07
+  - start: 2025-07-01
+    end: 2025-09-26
+  - start: 2026-06-15
+    end: 2026-09-07
 photo: /assets/images/team/fellows-2025/Cody-Tanner.jpg
 institution: University of Washington
 e-mail: cjt05@uw.edu