Fixes some cargo gun descriptions and lowers 38 ammo price. #15967

Job	Run time
Run Linters	3m 2s
Compile Maps	51s
Windows Build	5m 17s
Integration Tests (BASIC_TESTS) / run_integration_tests	3m 19s
Integration Tests (CREATE_AND_DESTROY_TEST) / run_integration_tests	2m 57s
Integration Tests (PLANET_GEN_TEST) / run_integration_tests	5m 6s
Integration Tests (RUIN_PLACEMENT_TEST) / run_integration_tests	4m 53s
Integration Tests (SHIP_PLACEMENT_TEST) / run_integration_tests	10m 8s
	35m 33s

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