Indicate name/url are mandatory in git remote add

Changed square brackets to angled brackets to indicate that name and
url are mandatory when executing `git remote add`:

usage: git remote add [<options>] <name> <url>

Author: crd

book/02-git-basics/sections/remotes.asc

@@ -64,7 +64,7 @@ Notice that these remotes use a variety of protocols; we'll cover more about thi
 ==== Adding Remote Repositories
 
 We've mentioned and given some demonstrations of adding remote repositories in previous sections, but here is how to do it explicitly.(((git commands, remote)))
-To add a new remote Git repository as a shortname you can reference easily, run `git remote add [shortname] [url]`:
+To add a new remote Git repository as a shortname you can reference easily, run `git remote add <shortname> <url>`:
 
 [source,console]
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