fix: typos in comments (#10)

internal/engine/docker.go

@@ -209,7 +209,7 @@ func (e *Docker) exec(box *config.Box, step *config.Step, req Request, dir strin
 
 	if err.Error() == "signal: killed" {
 		if step.Action == actionRun {
-			// we have to "docker kill" the container here, because the proccess
+			// we have to "docker kill" the container here, because the process
 			// inside the container is not related to the "docker run" process,
 			// and will hang forever after the "docker run" process is killed
 			go func() {

internal/engine/engine.go

@@ -63,7 +63,7 @@ func (err ExecutionError) Unwrap() error {
 }
 
 // An ArgumentError is returned if code execution failed
-// due to the invalid value of the request agrument.
+// due to the invalid value of the request argument.
 type ArgumentError struct {
 	name   string
 	reason error