useless variables
CDRIVER-425 add docs for get_collection_info
CDRIVER-426 add docs for get_index_info
fix return type in docs
fix memory leak on legacy fallback in mongoc_database_get_collection_info
fix memory leak on legacy fallback in mongoc_collection_get_index_info
minor: kill warning regarding local var shadowing
minor: fix unused variable warning in tests
Merge branch 'mongodb-master'