Adds Missing Clue Token to WHO cards

Three cards (Rory Williams, Sally Sparrow, and Sarah Jane Smith) are capable of Investigating and were not reverse-related to the Clue token.

tokens.xml

@@ -1975,6 +1975,9 @@ Cloud Sprite can block only creatures with flying.</text>
             <reverse-related exclude="exclude">Osgood, Operation Double</reverse-related>
             <reverse-related>Press for Answers</reverse-related>
             <reverse-related>Root Out</reverse-related>
+            <reverse-related>Rory Williams</reverse-related>
+            <reverse-related>Sally Sparrow</reverse-related>
+            <reverse-related>Sarah Jane Smith</reverse-related>
             <reverse-related>Search the Premises</reverse-related>
             <reverse-related>Secrets of the Key</reverse-related>
             <reverse-related count="2" exclude="exclude">Secrets of the Key</reverse-related>