docs: fix EncMode example in the package comment #375
Merged
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A few of the examples show calling the EncMode method with only one result (the mode) rather than a mode and an error.
Fixes #374.
N.B.: This PR is morally a documentation fix, although it does change a source file. I verified that all the tests still pass, but omitted the checklist on that basis. If you'd prefer to have it anyway, I'm happy to update the PR.