[docs] [issue18646] Improve tutorial entry on 'Lambda Forms'.

[Roundup Robot]

Roundup Robot added the comment:

New changeset ef1a17d5e263 by Georg Brandl in branch '3.3':
Closes #18646: improve lambda docs in tutorial.  Original patch by Terry Reedy.
http://hg.python.org/cpython/rev/ef1a17d5e263

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