Update the pmi2 README file.

contribs/pmi2/README

@@ -4,7 +4,7 @@
 #export $SLURM_ROOT=slurm_install
 # for example SLRUM_ROOT=/home/david/clusters/master/linux
 #
-# gcc -g -O0 -o testpmi2 testpmi2.c -I$SLURM_ROOT/include /home/david/clusters/master/linux/lib/libpmi2.so
+# gcc -g -O0 -o testpmi2 testpmi2.c -I$SLURM_ROOT/include $SLURM_ROOT/lib/libpmi2.so
 #
-# gcc -g -O0 -o testpmixring testpmixring.c -I$SLURM_ROOT/include /home/david/clusters/master/linux/lib/libpmi2.so
+# gcc -g -O0 -o testpmixring testpmixring.c -I$SLURM_ROOT/include $LSURM_ROOT/lib/libpmi2.so
 #