Corrected `downloadJavadocs` entry to simply `downloadJavadoc` (without the "s")
Corrected `downloadJavadocs` entry to simply `downloadJavadoc` (without the "s")

Apparently it's supposed to be `downloadJavadoc`, as mentioned in http://gradle.org/docs/current/dsl/org.gradle.plugins.ide.idea.model.IdeaModule.html

Signed-off-by: Ealden Esto E. Escanan <ff27627daef6b3172da4425363457b1137a9e29e@gmail.com>

t3t5u/gradle-android-plugin,jvoegele/gradle-android-plugin,t3t5u/gradle-android-plugin,jvoegele/gradle-android-plugin