fix: non-ASCII Unicode characters in code

Author: cushon

google-cloud-spanner/src/main/java/com/google/cloud/spanner/StructReader.java

@@ -648,7 +648,7 @@ default <T extends ProtocolMessageEnum> List<T> getProtoEnumList(
 
   List<UUID> getUuidList(int columnIndex);
 
-  List<UUID> getUuidList(String columnNameÏ);
+  List<UUID> getUuidList(String columnName);
 
   /**
    * @param columnIndex index of the column