Update links to Rajeev Thakur's papers (#5605)

Author: mattjala

src/H5FDpublic.h

@@ -77,8 +77,8 @@
  * Defining H5FD_FEAT_DATA_SIEVE for a VFL driver means that
  * the library will attempt to cache raw data as it is read from/written to
  * a file in a "data sieve" buffer.  See Rajeev Thakur's papers:
- *  http://www.mcs.anl.gov/~thakur/papers/romio-coll.ps.gz
- *  http://www.mcs.anl.gov/~thakur/papers/mpio-high-perf.ps.gz
+ *  https://web.cels.anl.gov/~thakur/papers/romio-coll.pdf
+ *  https://web.cels.anl.gov/~thakur/papers/users-guide.pdf
  */
 #define H5FD_FEAT_DATA_SIEVE 0x00000008
 /*