Docs: Reformat numbered lists into AsciiDoc syntax

Docs: Reformat numbered lists into AsciiDoc syntax

This commit improves list formatting in the Batch Importing section by
converting various hard-coded numbered lists into AsciiDoc syntax. Where
images are included, those are forced to be inline by adding a '+' to the
preceeding line. And whitespace was removed from the end of two lines. No
other changes are included.

Signed-off-by: Remington Steed <rjs7@calvin.edu>