Doc: Grammar add for config tool doc

Signed-off-by: Deb Taylor <deb.taylor@intel.com>

Author: deb-intel

doc/tutorials/acrn_configuration_tool.rst

@@ -109,7 +109,7 @@ Additional scenario XML elements:
 
 ``guest_flags``: Select all applicable flags for the VM.
 
-``vcpu_affinity``: vCPU affinity map; Each vCPU will pin to the selected pCPU ID and different vCPU should not pin to same pCPU.
+``vcpu_affinity``: vCPU affinity map. Each vCPU will pin to the selected pCPU ID. A different vCPU cannot pin to the same pCPU.
 
 ``size`` under parent of ``epc_section``: SGX EPC section base; must be page aligned.