update documentation

INSTALL.md

@@ -103,11 +103,11 @@ It this is not desired, it is possible to build *ELPA* with only one (not necess
 real and complex valued case, respectively. This can be done with the "--with-real-..-kernel-only" and
 "--with-complex-..-kernel-only" configure options. For details please do a "configure --help"
 
-### Non MPI one node shared-memory version of ELPA ###
+### No MPI, one node shared-memory version of ELPA ###
 
 Since release 2016.05.001 it is possible to build *ELPA* without any MPI support. This version can be used
 by applications, which do not have any MPI parallelisation. To set this version, use the
-"--enable-shared-memory-only" configure flag. It is strongly recommmended to also set the "--enable-openmp"
+"--with-mpi=0" configure flag. It is strongly recommmended to also set the "--enable-openmp"
 option, otherwise no parallelisation whatsoever will be present.
 
 ### Doxygen documentation ###

USERS_GUIDE.md

@@ -85,7 +85,7 @@ please have a look at the man pages and/or the online documentation (see above)
 
 #### Shared-memory version of *ELPA* ####
 
-If the *ELPA* library has been compiled with the configure option "--enable-shared-memory-only",
+If the *ELPA* library has been compiled with the configure option "--with-mpi=0",
 no MPI will be used.
 
 Still the **same** call sequence as in the MPI case can be used (see above).