docs(topojson-export): add topojson response documentation #660

Job	Run time
Build default builder image	2m 15s
Integration tests (maven, integrationtests.ConfigEnvironmentTest)	5m 30s
Integration tests (maven, integrationtests.ConfigFileTest)	6m 13s
Integration tests (maven, integrationtests.ConfigLookupTest)	5m 42s
Integration tests (maven, integrationtests.GeoToolsTest)	4m 31s
Integration tests (maven, integrationtests.GraphRepoTest)	6m 54s
Integration tests (jar, integrationtests.ConfigEnvironmentTest)	3m 16s
Integration tests (jar, integrationtests.ConfigFileTest)	3m 8s
Integration tests (jar, integrationtests.ConfigLookupTest)	3m 23s
Integration tests (jar, integrationtests.GeoToolsTest)	1m 56s
Integration tests (jar, integrationtests.GraphRepoTest)	3m 25s
Integration tests (war, integrationtests.ConfigEnvironmentTest)	2m 45s
Integration tests (war, integrationtests.ConfigFileTest)	3m 9s
Integration tests (war, integrationtests.ConfigLookupTest)	3m 45s
Integration tests (war, integrationtests.GeoToolsTest)	2m 59s
Integration tests (war, integrationtests.GraphRepoTest)	4m 58s
	1h 3m 49s

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