Fixed a typo in BakedLightmap documentation
Fixed a typo in BakedLightmap documentation

"capture_propagation" member documentation description was missing the second 'p' in "propagation". Fixed this minor typo
Also resubmitting pull request to 3.x branch as per @Calinou's recommendation.
ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot