docstring improvements and typo fixes (#7862)

nomad/structs/csi.go

@@ -712,6 +712,10 @@ func (p *CSIPlugin) AddPlugin(nodeID string, info *CSIInfo) error {
 				p.ControllersHealthy -= 1
 			}
 		}
+		// note: for this to work as expected, only a single
+		// controller for a given plugin can be on a given Nomad
+		// client, they also conflict on the client so this should be
+		// ok
 		p.Controllers[nodeID] = info
 		if info.Healthy {
 			p.ControllersHealthy += 1

nomad/structs/node.go

@@ -121,7 +121,7 @@ type CSIControllerInfo struct {
 	// the controller attachment flow.
 	SupportsAttachDetach bool
 
-	// SupportsListVolums is true when the controller implements the ListVolumes
+	// SupportsListVolumes is true when the controller implements the ListVolumes
 	// RPC. NOTE: This does not guaruntee that attached nodes will be returned
 	// unless SupportsListVolumesAttachedNodes is also true.
 	SupportsListVolumes bool