Fix error and warning messages after reverting

the mca_base_env_list to being semicolon delimited.

This commit was SVN r32179.

opal/mca/base/help-mca-var.txt

@@ -123,8 +123,8 @@ starting your job.
   Source:     %s
 #
 [incorrect-env-list-param]
-WARNING: The format of MCA parameter "mca_base_env_list" is a plus-sign (+) delimited
-list of VAR=VAL and/or VAR instances, e.g.: -mca mca_base_env_list VAR1=VAL1+VAR2+VAR3=VAL3;... 
+WARNING: The format of MCA parameter "mca_base_env_list" is a semicolon (;) delimited
+list of VAR=VAL and/or VAR instances, e.g.: -mca mca_base_env_list 'VAR1=VAL1;VAR2;VAR3=VAL3'... 
 If a variable, VAR, is listed but not explicitly assigned a value in the command line, VAR will 
 be assigned the value set in the executing environment.
 

orte/tools/orterun/help-orterun.txt

@@ -655,7 +655,7 @@ WARNING: The mechanism by which environment variables are passed to OMPI is chan
 Specifically, beginning in the 1.9.x/2.0.x series, using "-x" to set environment 
 variables is deprecated. Please use the "mca_base_env_list" MCA parameter. With this new 
 mechanism, mpirun ... -x env_foo1=bar1 -x env_foo2=bar2 -x env_foo3 ...
-becomes: mpirun ... -mca mca_base_env_list env_foo1=bar1+env_foo2=bar2+env_foo3 ...
+becomes: mpirun ... -mca mca_base_env_list 'env_foo1=bar1;env_foo2=bar2;env_foo3' ...
 #
 [orterun:conflict-env-set]
 ERROR: You have attempted to pass environment variables to OMPI with both the "-x" method (deprecated starting