Fix comment

Source/cmSetTargetPropertiesCommand.h

@@ -55,7 +55,7 @@ public:
       return
         "SET_TARGET_PROPERTIES(target1 target2 .. filen PROPERTIES prop1 value1 prop2 value2 ... prop2 valuen)"
         "Set properties on a target. The syntax for the command is to list all the files you want "
-        "to change, and then provide the values you want to set next.  Properties that cmake knows about are PREFIX and POSTFIX for Unix systems and libraries.   CMake also knows about LINK_FLAGS, which can be used to add extra flags to the link step of a target."
+        "to change, and then provide the values you want to set next.  Properties that cmake knows about are PREFIX and SUFFIX for Unix systems and libraries.   CMake also knows about LINK_FLAGS, which can be used to add extra flags to the link step of a target."
         "DEFINE_SYMBOL is a symbol that is defined when compiling C or C++ sources.  "
         "If not set here then it is set to target_EXPORTS by default "
         "(with some substitutions if target is not a valid C identifier).  "