Add package-info documentation

...g/orekit/rugged/adjustment/measurements/package-info.java

src/main/java/org/orekit/rugged/adjustment/package-info.java

src/main/java/org/orekit/rugged/api/package-info.java

src/main/java/org/orekit/rugged/errors/package-info.java

...rg/orekit/rugged/intersection/duvenhage/package-info.java

...ain/java/org/orekit/rugged/intersection/package-info.java

src/main/java/org/orekit/rugged/linesensor/package-info.java

src/main/java/org/orekit/rugged/los/package-info.java

src/main/java/org/orekit/rugged/raster/package-info.java

src/main/java/org/orekit/rugged/refraction/package-info.java

src/main/java/org/orekit/rugged/utils/package-info.java