Fix typos (#3527)

main/commands/base/env.go

@@ -7,7 +7,7 @@ import (
 
 // CommandEnvHolder is a struct holds the environment info of commands
 type CommandEnvHolder struct {
-	// Excutable name of current binary
+	// Executable name of current binary
 	Exec string
 	// commands column width of current command
 	CommandsWidth int

main/json/json.go

@@ -43,7 +43,7 @@ func init() {
 			case io.Reader:
 				return serial.LoadJSONConfig(v)
 			default:
-				return nil, errors.New("unknow type")
+				return nil, errors.New("unknown type")
 			}
 		},
 	}))

main/toml/toml.go

@@ -43,7 +43,7 @@ func init() {
 			case io.Reader:
 				return serial.LoadTOMLConfig(v)
 			default:
-				return nil, errors.New("unknow type")
+				return nil, errors.New("unknown type")
 			}
 		},
 	}))

main/yaml/yaml.go

@@ -43,7 +43,7 @@ func init() {
 			case io.Reader:
 				return serial.LoadYAMLConfig(v)
 			default:
-				return nil, errors.New("unknow type")
+				return nil, errors.New("unknown type")
 			}
 		},
 	}))