As of https://codereview.chromium.org/1406053003 relative paths are no
longer valid for the solution name.  Update the docs to use the full
current directory instead.

BUG=angleproject:1204

Change-Id: I42b289fdad6d85901f431bb701f2a08e0ad0deb3
Reviewed-on: https://chromium-review.googlesource.com/311180Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Geoff Lang <geofflang@chromium.org>