Update convert_encoding.rst

The arguments were in incorrect order. The first should be `to` and the second should be `from` - just like the text describes it.
minor #1509 Update convert_encoding.rst: wrong argument order (binarious)

This PR was merged into the 1.16-dev branch.

Discussion
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Update convert_encoding.rst: wrong argument order

The arguments are in incorrect order. The first should be `to` and the second should be `from` - just like the text describes it.

Commits
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4e1d9a7 Update convert_encoding.rst