Update syntax error example in tutorial

Clarify error message explanation for syntax errors.

Author: blesson-07

Doc/tutorial/errors.rst

@@ -17,16 +17,17 @@ Syntax Errors
 Syntax errors, also known as parsing errors, are perhaps the most common kind of
 complaint you get while you are still learning Python::
 
-   >>> while True print('Hello world')
+   >>> a[1]] = 0
      File "<stdin>", line 1
-       while True print('Hello world')
-                  ^^^^^
-   SyntaxError: invalid syntax
-
-The parser repeats the offending line and displays little arrows pointing
-at the place where the error was detected.  Note that this is not always the
-place that needs to be fixed.  In the example, the error is detected at the
-function :func:`print`, since a colon (``':'``) is missing just before it.
+       a[1]] = 0
+             ^
+   SyntaxError: unmatched ']'
+
+The parser repeats the offending line and displays a little arrow pointing
+at the earliest point in the line where the error was detected.
+Note that this is not always the place that needs to be fixed.
+In the example, the arrow points to the extra ``]`` bracket, which is where the
+error is detected.
 
 The file name (``<stdin>`` in our example) and line number are printed so you
 know where to look in case the input came from a file.