Genex: Fix grammatical error in TARGET_OBJECTS error message

Source/cmGeneratorExpressionNode.cxx

@@ -1629,8 +1629,8 @@ static const struct TargetObjectsNode : public cmGeneratorExpressionNode
         type != cmStateEnums::OBJECT_LIBRARY) {
       std::ostringstream e;
       e << "Objects of target \"" << tgtName
-        << "\" referenced but is not an allowed library types (EXECUTABLE, "
-        << "STATIC, SHARED, MODULE, OBJECT).";
+        << "\" referenced but is not one of the allowed target types "
+        << "(EXECUTABLE, STATIC, SHARED, MODULE, OBJECT).";
       reportError(context, content->GetOriginalExpression(), e.str());
       return std::string();
     }

Tests/RunCMake/File_Generate/OutputNameMatchesObjects-stderr.txt

@@ -3,7 +3,7 @@ CMake Error at OutputNameMatchesObjects.cmake:[0-9]+ \(file\):
 
     \$<TARGET_OBJECTS:foo>
 
-  Objects of target "foo" referenced but is not an allowed library types
-  \(EXECUTABLE, STATIC, SHARED, MODULE, OBJECT\).
+  Objects of target "foo" referenced but is not one of the allowed target
+  types \(EXECUTABLE, STATIC, SHARED, MODULE, OBJECT\).
 Call Stack \(most recent call first\):
   CMakeLists.txt:[0-9]+ \(include\)

Tests/RunCMake/ObjectLibrary/BadSourceExpression3-stderr.txt

@@ -3,7 +3,7 @@ CMake Error at BadSourceExpression3.cmake:2 \(add_library\):
 
     \$<TARGET_OBJECTS:NotObjLib>
 
-  Objects of target "NotObjLib" referenced but is not an allowed library
-  types \(EXECUTABLE, STATIC, SHARED, MODULE, OBJECT\).
+  Objects of target "NotObjLib" referenced but is not one of the allowed
+  target types \(EXECUTABLE, STATIC, SHARED, MODULE, OBJECT\).
 Call Stack \(most recent call first\):
   CMakeLists.txt:[0-9]+ \(include\)

Tests/RunCMake/TargetObjects/NotObjlibTarget-stderr.txt

@@ -3,7 +3,7 @@ CMake Error at NotObjlibTarget.cmake:[0-9]+ \(file\):
 
     \$<TARGET_OBJECTS:IFaceLib>
 
-  Objects of target "IFaceLib" referenced but is not an allowed library types
-  \(EXECUTABLE, STATIC, SHARED, MODULE, OBJECT\).
+  Objects of target "IFaceLib" referenced but is not one of the allowed
+  target types \(EXECUTABLE, STATIC, SHARED, MODULE, OBJECT\).
 Call Stack \(most recent call first\):
   CMakeLists.txt:[0-9]+ \(include\)