chore: import upstream snapshot with attribution

testing/generation/command_docs/synopses/alter_database.txt

@@ -0,0 +1,23 @@
+ALTER DATABASE $name$ [ [ WITH ] $option$ [ ... ] ]
+
+ALTER DATABASE $name$ RENAME TO $new_name$
+
+ALTER DATABASE $name$ OWNER TO { $new_owner$ | CURRENT_ROLE | CURRENT_USER | SESSION_USER }
+
+ALTER DATABASE $name$ SET TABLESPACE $new_tablespace$
+
+ALTER DATABASE $name$ REFRESH COLLATION VERSION
+
+ALTER DATABASE $name$ SET $configuration_parameter$ { TO | = } { $value$ | DEFAULT }
+
+ALTER DATABASE $name$ SET $configuration_parameter$ FROM CURRENT
+
+ALTER DATABASE $name$ RESET $configuration_parameter$
+
+ALTER DATABASE $name$ RESET ALL
+
+where $option$ is:
+
+ALLOW_CONNECTIONS $allowconn$ |
+    CONNECTION LIMIT $connlimit$ |
+    IS_TEMPLATE $istemplate$