fix typo in test case description

tests/orbit_test.cpp

@@ -109,7 +109,7 @@ TEST_CASE("state vectors to orbital elements, example 3.1", "[orbits]")
 	REQUIRE_THAT(el.nu, WithinAbs(orbitClampAngle(DEG2RAD(280)), 1));
 }
 
-TEST_CASE("elements to state vectors, edge case equatorial orbit", "[orbits]")
+TEST_CASE("state vectors to elements, edge case equatorial orbit", "[orbits]")
 {
 	double mu = EARTH_GRAVITATIONAL_PARAMETER;
 	dvec3 r = dvec3(0, -8000, 0);