documentation needs update with current naming of default debugger

[swhib]

The official Python Tutorial doesn't seem to be up-to-date.

In February the default debug config was renamed to Python: Current File.

the content under the heading Debuggin Hello World doesn't reflect this change:

• The text says "These different configurations are fully explained in Debugging; for now, just select "Python,".
• the accompanying image also still contains the old name.

[brettcannon]

Reported upstream.