[RST/en] Fix compile errors from link and escaping

There were two issues here:

* The non-inline link was used incorrectly, and should have a colon after the specifier. 
* A compile error was generated from having a non-escaped `*`.

These can be verified by running `rst2html`:

```sh
$ rst2html.py ./restructuredtext.rst tmp.html
./restructuredtext.rst:24: (WARNING/2) Inline emphasis start-string without end-string.
./restructuredtext.rst:59: (WARNING/2) malformed hyperlink target.
```

After adding the colon, and adding the escape

```sh
$ rst2html.py ./restructuredtext.rst tmp.html
$
```

I've also added a sentence on escaping.

0 files changed, 0 insertions, 0 deletions