docs: add missing sb_qflags values

We're missing a few of the sb_qflags values, so add them to the docs.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
diff --git a/design/XFS_Filesystem_Structure/allocation_groups.asciidoc b/design/XFS_Filesystem_Structure/allocation_groups.asciidoc
index 68f934a..992615d 100644
--- a/design/XFS_Filesystem_Structure/allocation_groups.asciidoc
+++ b/design/XFS_Filesystem_Structure/allocation_groups.asciidoc
@@ -282,6 +282,10 @@
 | +XFS_OQUOTA_ENFD+		| Other (group/project) quotas are enforced.
 | +XFS_OQUOTA_CHKD+		| Other (group/project) quotas have been checked.
 | +XFS_GQUOTA_ACCT+		| Group quota accounting is enabled.
+| +XFS_GQUOTA_ENFD+		| Group quotas are enforced.
+| +XFS_GQUOTA_CHKD+		| Group quotas have been checked.
+| +XFS_PQUOTA_ENFD+		| Project quotas are enforced.
+| +XFS_PQUOTA_CHKD+		| Project quotas have been checked.
 |=====
 
 *sb_flags*::