Correct syntax of commands from command_local.cc

COMMAND-Execute.md

@@ -7,17 +7,17 @@ execute={command,arg1,arg2,...}
 This will execute the external command with arguments arg1,arg2,.... It will throw an error if the exit status is not 0, and return 0 itself otherwise. 
 
 ```
-execute_nothrow={command,arg1,arg2,...}
+execute.nothrow={command,arg1,arg2,...}
 ```
 This will execute the external command with arguments arg1,arg2,.... It will return the return value of the command. 
 
 ```
-execute_capture={command,arg1,arg2,...}
+execute.capture={command,arg1,arg2,...}
 ```
 This will execute the external command with arguments arg1,arg2,.... It will throw an error if the exit status is not 0, and return the stdout output of the command otherwise. 
 
 ```
-execute_capture_nothrow={command,arg1,arg2,...}
+execute.capture_nothrow={command,arg1,arg2,...}
 ```
 This will execute the external command with arguments arg1,arg2,.... It will return the stdout output of the command.