GROOVY-5242: groovy.lang.Closure javadoc should mention method resolution in resolve strategy constants

https://jira.codehaus.org/browse/GROOVY-5242
Merge pull request #102 from PascalSchumacher/GROOVY-5242_Closure_javadoc_resolve_strategies

GROOVY-5242: groovy.lang.Closure javadoc should mention method resolution...
merged