Fix parameter names in docs
RELNOTES: None
# The API of this is largely the same as the native maven_jar rule,
# except for the server attribute, which is not implemented. The optional
# settings supports passing a custom Maven settings.xml to download the JAR.
-# 2) maven_aar(name, artifact, repository, sha1)
+# 2) maven_aar(name, artifact, sha1, settings)
# The API of this rule is the same as maven_jar except that the artifact must
# be the Maven coordinate of an AAR and it does not support the historical
# repository and server attributes.
