fix trailing whitespace and update comment (#418)

* fix trailing whitespace and update comment

* fix lint

proto/topo.proto

@@ -81,30 +81,31 @@ message Node {
   // If interfaces is empty the interfaces defined in the links portion of the
   // topology will be populated into the node.
   map<string, Interface> interfaces = 12;
-  // Any host constraints required by the node. These may not be required by a 
+  // Any host constraints required by the node. These may not be required by a
   // vendor, but it can be used to provide requirements for the node.
   repeated HostConstraint host_constraints = 13;
 }
 
 // HostConstraint is a constraint on the host where the node is running.
-message HostConstraint{
-  oneof constraint{
-    // Includes the required sysctl settings that need to be configured
+message HostConstraint {
+  oneof constraint {
+    // Includes the required kernel parameters that need to be configured.
     KernelParam kernel_constraint = 1;
   }
 }
 
-// Kernel parameter for Sysctl settings for the host
-message KernelParam{
+// KernelParam is a parameter on the host kernel.
+message KernelParam {
   // MIB style name of the kernel state to constrain.
   string name = 1;
-  oneof ConstraintType{
+  oneof ConstraintType {
     BoundedInteger bounded_integer = 2;
   }
 }
 
-// BoundedInteger to capture the range of max or min for a particular setting
-message BoundedInteger{
+// BoundedInteger to capture the range of max or min for a particular
+// constraint.
+message BoundedInteger {
   int64 max_value = 1;
   int64 min_value = 2;
 }