Updates to format documentation
Updates to format documentation

- Added some general notes about api usage
- Added docs for WKT and GeoJSON formats
- Condensed Polyshape benchmarks into a single table

Signed-off-by: jdeolive <a2227d52c95cb6f286ff575825e36cb0eaada813@gmail.com>

spatial4j/spatial4j,spatial4j/spatial4j