Fixes to tutorial #3 and #4

[sbrunswi]

Issues identified in tutorial sesssion

• [x] link to schema is outdated in tutorial 3
• [x] Link to bigquery SQL syntax
• [x] Additional commands on how to list projects and tables that you have access to!

[harshpavuluri]

Link to hack data: https://docs.google.com/spreadsheets/d/e/2PACX-1vTw11QCzmLmg1RHtwd3Xs4FpFP3zzZEr7-BKJ-hceqxYInKVsMyBkD20BySWDA1sr2p4yhpwsyY8SLl/pubhtml

Link to Tutorial data: https://docs.google.com/spreadsheets/d/e/2PACX-1vRL-897BXh4BQFYMX4B06knO40emWSWC4Bug12QhXSE-wYZcqZZwLDPaLHb3AfOO0wEMSyKKTZaqtDn/pubhtml

[harshpavuluri]

Links have been updated T3 for the schema. Permissions errors should be resolved now. T3 is updated on live and dev now