Per request from Jeff, slightly modify the show_help message as the precise name of the NUMA-containing packages differs based on OS and distro

cmr=v1.8.2:reviewer=jsquyres:subject=modify show_help message

This commit was SVN r32122.

orte/mca/rmaps/base/help-orte-rmaps-base.txt

@@ -164,9 +164,10 @@ support binding memory to the process location.
 
   Node:  %s
 
-This usually is due to not having libnumactl and libnumactl-devel
+This usually is due to not having the required NUMA support installed
-installed on the node. This is a warning only; your job will continue,
+on the node. In some Linux distributions, the required support is
-though performance may be degraded.
+contained in the libnumactl and libnumactl-devel packages.
+This is a warning only; your job will continue, though performance may be degraded.
 #
 [rmaps:membind-not-supported-fatal]
 A request was made to bind a process. While the system
@@ -175,9 +176,10 @@ support binding memory to the process location.
 
   Node:  %s
 
-This usually is due to not having libnumactl and libnumactl-devel
+This usually is due to not having the required NUMA support installed
-installed on the node. The provided memory binding policy requires
+on the node. In some Linux distributions, the required support is
-that we abort the job at this time.
+contained in the libnumactl and libnumactl-devel packages.
+The provided memory binding policy requires that we abort the job at this time.
 #
 [rmaps:no-bindable-objects]
 No bindable objects of the specified type were available