A handful of typo fixes (and github-ery practice)

Hi Ricardo,

This pull request started off as two fixes, but as I used the docs to expand my horizons I found some other stuff to tune up (including a buggy example).

Here are the original two bugs (from before I rewrote the pull request comment)

1. almost certainly an incorrect example (should use 50 passes)
1. a possible typo, import -> importer.

Also practicing github-ery.  I forked your repo, cloned it, made a branch on my machine, committed the fixes, pushed the branch back to my fork on github and then made this pull request with respect to the typos branch.  Please let me know how this worked out for you.

g.