added note about how the distance between 2 geo_points is calculated
added note about how the distance between 2 geo_points is calculated

crate/crate,EvilMcJerkface/crate,crate/crate,EvilMcJerkface/crate,aslanbekirov/crate,aslanbekirov/crate,aslanbekirov/crate,EvilMcJerkface/crate,crate/crate