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.
change mention of print to sprintf in format filter

The format specifiers are actually mentioned on the [sprintf(http://php.net/sprintf)] page
merged branch jrobeson/patch-1 (PR #1108)

This PR was merged into the master branch.

Discussion
----------

change mention of print to sprintf in format filter

The format specifiers are actually mentioned on the [sprintf](http://php.net/sprintf) page

Commits
-------

5746c11 change mention of print to sprintf in format filter
merged branch luiges90/patch-1 (PR #1107)

This PR was merged into the master branch.

Discussion
----------

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
-------

3ddff67 Update slice.rst