merged branch luiges90/patch-1 (PR #1107)

This PR was merged into the master branch.

Discussion
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Update slice.rst

I was (somehow) misled by the example, thinking `'1234'[2:]` outputs `34` because it `2:` mean copy the last 2 characters...

This happens when you are in a hurry and didn't look into the text.

Let makes it less ambiguous.

Commits
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3ddff67 Update slice.rst