Update cpp/src/arrow/util/byte_size.cc

Co-authored-by: Rok Mihevc <rok@mihevc.org>

Author: robert3005

cpp/src/arrow/util/byte_size.cc

@@ -201,7 +201,7 @@ struct GetByteRangesArray {
     RETURN_NOT_OK(range_offsets->Append(sizeof(c_type) * offset));
     RETURN_NOT_OK(range_lengths->Append(sizeof(c_type) * length));
 
-    // The following calculation is an over/under estimate of the size since views buffer
+    // The following calculation is an over estimate of the size since views buffer
     // might
     // 1. Not reference all the values in data buffers (the array was filtered without gc)
     // 2. Reference a value multiple times without repeating it in the data buffer