Fix for Chrome.
"number random number" -> "random number"
Merge pull request #1392 from mark-otaris/patch-1

"number random number" -> "random number"
Update bar-2.markdown

It's the x-axis that's being added with this step, not the y.
Merge pull request #1436 from erictheise/patch-1

Update bar-2.markdown
Merge remote-tracking branch 'remotes/mbostock-original/gh-pages' into gh-pages