remove LTS from Ubuntu 15.10 in aws driver docs
remove LTS from Ubuntu 15.10 in aws driver docs

The 14.04.x and 16.04 [release](https://wiki.ubuntu.com/Releases) are LTS., but Ubuntu 15.10 is not an LTS release, so I'd suggest removing that designation from the docs.

Signed-off-by: Aaron Culich <dfa6ce8abf35555d42d139037932f78c91f75f7b@berkeley.edu>

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