Update flowchart.md

docs/syntax/flowchart.md

@@ -467,7 +467,7 @@ flowchart TB
     A & B--> C & D
 ```
 
-If you describe the same diagram using the the basic syntax, it will take four lines. A
+If you describe the same diagram using the basic syntax, it will take four lines. A
 word of warning, one could go overboard with this making the flowchart harder to read in
 markdown form. The Swedish word `lagom` comes to mind. It means, not too much and not too little.
 This goes for expressive syntaxes as well.