Update README.md

Put in correct link to online guide

Author: bkmgit

README.md

@@ -25,8 +25,8 @@ You can run all of the supported benchmarks, or a subset specified in the
 command line using one executable file. Use command-line parameters to specify
 various settings, such as time measurement, message lengths, and selection of 
 communicators. For details, see the Intel(R) MPI Benchmarks User's Guide 
-located at: 
-https://software.intel.com/en-us/articles/creating-custom-benchmarks-for-imb-2019.
+located at:
+https://software.intel.com/en-us/imb-user-guide.
 
 By default, Intel(R) MPI Benchmarks is installed at:
   - C:\Program Files (x86)\IntelSWTools\imb on Windows* OS