Use c.Process instead of Process

Author: gnoack

src/os/exec/exec.go

@@ -369,7 +369,7 @@ func lookExtensions(path, dir string) (string, error) {
 
 // Start starts the specified command but does not wait for it to complete.
 //
-// If Start returns successfully, the Process field will be set.
+// If Start returns successfully, the c.Process field will be set.
 //
 // The Wait method will return the exit code and release associated resources
 // once the command exits.