docs/index.rst: Remove line blocks

Avoid errors like:

  .../docs/index.rst:26: WARNING: Line block ends without a blank line.

by dropping the line blocks [1] added in 323ec78d (Update
documentation of each parameter, 2014-07-29).  I don't think we want
to manually wrap the line endings here, and even if we did the syntax
was invalid (continuation lines need to begin with a space in place of
the vertical bar [1]).

Since I was touching that section of the docs, I also replaced the
manually-escaped 'CORS\_' and similar with inline literals [2].
Besides allowing us to use the more-easily-grepped 'CORS_', it gives
us nicer styling.

[1]: http://docutils.sourceforge.net/docs/ref/rst/restructuredtext.html#line-blocks
[2]: http://docutils.sourceforge.net/docs/ref/rst/restructuredtext.html#inline-literals
docs/index.rst: Fix short underline for 'Full list of options'

Avoid:

  .../docs/index.rst:156: WARNING: Title underline too short.

323ec78d (Update documentation of each parameter, 2014-07-29) changed
the title for this section from 'Options' to 'Full list of options',
but failed to adjust the underline length appropriately.
docs/conf.py: Remove _static from html_static_path

Avoid:

  WARNING: html_static_path entry '.../docs/_static' does not exist

because we have no static source in doc/_static.
Merge pull request #44 from wking/doc-fixes

Fix Sphinx warnings (broken line blocks, short title underline, html_static_path)