Fix Tensor documentation page.

The extra [TOC] tag is generating a huge floating duplicated
table-of-contents, which obscures the majority of the page
(see bottom of https://eigen.tuxfamily.org/dox/unsupported/eigen_tensors.html).
Remove it.

Also, headers do not support markup (see
[doxygen bug](https://github.com/doxygen/doxygen/issues/7467)), so
backticks like
```
```
end up generating titles that looks like
```
Constructor <tt>Tensor<double,2></tt>
```
Removing backticks for now.  To generate proper formatted headers, we
must directly use html instead of markdown, i.e.
```
<h2>Constructor <code>Tensor&lt;double,2&gt;</code></h2>
```
which is ugly.

Fixes #2254.

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