DOC/ENH: docs for validate_user and validate_password, touch ups on checks
DOC/ENH: docs for validate_user and validate_password, touch ups on checks

adamrp/qiita,antgonza/qiita,ElDeveloper/qiita,RNAer/qiita,ElDeveloper/qiita,adamrp/qiita,squirrelo/qiita,squirrelo/qiita,biocore/qiita,RNAer/qiita,wasade/qiita,biocore/qiita,josenavas/QiiTa,wasade/qiita,josenavas/QiiTa,ElDeveloper/qiita,ElDeveloper/qiita,biocore/qiita,adamrp/qiita,biocore/qiita,squirrelo/qiita,antgonza/qiita,RNAer/qiita,wasade/qiita,adamrp/qiita,josenavas/QiiTa,antgonza/qiita,josenavas/QiiTa,RNAer/qiita,squirrelo/qiita,antgonza/qiita