* Update git-alias.md: add brs to prevent incorrect line behavior
currently these all appear on one line, in the rendered markdown viewer and also in the man page. That isn't what's wanted. What's wanted is for each to be on its own line, which this change implements, using the strategy I found in git-bulk.
* run make on git-alias
Although Github reserves the 'visionmedia' user space(a visit to there
will be redirected to 'tj'), it's better to
rename the links from visionmedia/git-extras to tj/git-extras