Manual: use unabbreviated first names in Spors2011 reference

[mgeier]

Using a letter followed by a dot seems to lead to strange formatting (the line is turned into an ordered list): https://ssr.readthedocs.io/en/latest/renderers.html#spors2011

Also, all other references have the full first names.

[mgeier]

While I'm at it, I've also updated the RTD settings.

Here is the rendered page: https://ssr--318.org.readthedocs.build/en/318/renderers.html#spors2011