Fix duplicate explicit links

[markcmiller86]

Description

This file had multiple cases of this kind of reST syntax...

video can be seen `here <https://www.seedme.org/node/49054#videos>`_.
A detailed example with a brief explanation in the comments can be seen
`here <https://bitbucket.org/seedme/seedme-python-client/src/master/demo.py?at=master&fileviewer=file-view-default>`_.

Because the link text, here, is same in both cases, Sphinx complains...

Running Sphinx v1.5.3
loading pickled environment... done
building [mo]: all of 0 po files
building [html]: all source files
updating environment: 1 added, 7 changed, 0 removed
reading sources... [100%] tutorials/index                                                                                           
/Users/miller86/visit/visit/src/doc/tutorials/Aneurysm.rst:4: WARNING: Duplicate explicit target name: "here".
looking for now-outdated files... none found
.
.
.

The solution is to switch to anonymous links by adding underscores.

This update does that.