Merge lp://staging/~drizzle-developers/drizzle/major-docs-cleanup into lp://staging/drizzle

docs/alter_schema.rst (+1/-6)
docs/alter_table.rst (+1/-13)
docs/commit.rst (+1/-42)
docs/create_index.rst (+1/-12)
docs/create_schema.rst (+4/-3)
docs/create_table.rst (+1/-2)
docs/ddl.rst (+2/-2)
docs/delete.rst (+1/-7)
docs/distinct.rst (+2/-32)
docs/dml.rst (+1/-1)
docs/drop_index.rst (+1/-5)
docs/flush.rst (+6/-6)
docs/functions/aggregatefunctions.rst (+10/-105)
docs/functions/control_flow.rst (+1/-77)
docs/functions/current_time_functions.rst (+1/-78)
docs/functions/date_trunc.rst (+1/-27)
docs/functions/datetime.rst (+3/-36)
docs/functions/extract_date_functions.rst (+1/-150)
docs/functions/logical.rst (+2/-193)
docs/functions/overview.rst (+1/-1)
docs/functions/string.rst (+52/-49)
docs/functions/string/comparative.rst (+6/-47)
docs/functions/string/conversion.rst (+4/-90)
docs/functions/string/length.rst (+3/-18)
docs/functions/string/modification.rst (+1/-114)
docs/functions/string/other.rst (+14/-59)
docs/functions/string/position.rst (+2/-111)
docs/groupby.rst (+2/-78)
docs/having.rst (+2/-58)
docs/insert.rst (+1/-34)
docs/join.rst (+1/-54)
docs/load_data_infile.rst (+1/-36)
docs/orderby.rst (+2/-47)
docs/queries.rst (+3/-12)
docs/rename.rst (+2/-12)
docs/resources/ascii_chart.rst (+1/-100)
docs/savepoints.rst (+3/-3)
docs/start_transaction.rst (+1/-1)
docs/string_data_types.rst (+4/-5)
docs/tables.rst (+1/-11)
docs/transactional.rst (+1/-1)
docs/update.rst (+1/-17)
docs/uuid_data_type.rst (+1/-11)
docs/where.rst (+2/-33)