[issue9139] Add examples for str.format()

[Ezio Melotti]

Ezio Melotti <ezio.melotti at gmail.com> added the comment:

Here is a new patch.
I fixed the typos, removed the examples from the first section and added a link to the examples section.
I also added the examples suggested by Eric plus an example about {:%}, and followed the suggestion of Éric and clarified the versionchanged message.

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Added file: http://bugs.python.org/file17840/issue9139v2.diff

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