Fix README.md command consistency

[jviide]

The ./configure command in README.md's Building Documentation section was missing the $ prefix. Add the prefix to be consistent with other commands in the document.

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @alexcrichton (or someone else) soon.

If any changes to this PR are deemed necessary, please add them as extra commits. This ensures that the reviewer can see what has changed since they last reviewed the code. Due to the way GitHub handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed. Large or tricky changes may require several passes of review and changes.

Please see the contribution instructions for more information.

[alexcrichton]

@bors: r+ b18ed5b

Thanks!

[bors]

⌛ Testing commit b18ed5b with merge cadfdb8...

[bors]

💔 Test failed - auto-win-msvc-64-opt-rustbuild

[alexcrichton]

@bors: retry

• Cascading failure on bots when interrupted when performing git operations #34595

On Fri, Jul 1, 2016 at 6:10 AM, bors notifications@github.com wrote:

💔 Test failed - auto-win-msvc-64-opt-rustbuild
https://buildbot.rust-lang.org/builders/auto-win-msvc-64-opt-rustbuild/builds/1634

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