Start blocking out some documentation.

- Fix some C rdoc so it is parsed correctly.
  - Fill out transaction testing.
  - Populate docs for DB options.

FossilOrigin-Name: f54dbfacf2dda100a116fdcc856ca5231e249f23238ca9d4355618e3a380a8f8

spec/lib/helper.rb

@@ -5,7 +5,18 @@
 
 if ENV[ 'COVERAGE' ]
 	require 'simplecov'
-	SimpleCov.start
+	require 'simplecov-console'
+	SimpleCov.formatter = SimpleCov::Formatter::MultiFormatter.new([
+		SimpleCov::Formatter::HTMLFormatter,
+		SimpleCov::Formatter::Console,
+	])
+	SimpleCov.start do
+		add_filter 'spec'
+		# enable_coverage :branch
+		add_group "Needing tests" do |file|
+			file.covered_percent < 90
+		end
+	end
 end
 
 require 'pathname'