code review from Josh and Robert

@@ -33,11 +33,11 @@
 .It Fa vmp
 The vmem arena to which the span should be added.
 .It Fa vaddr
 The base address of the span to add.
 .It Fa size
-The size of the span to add
+The size of the span to add.
 .It Fa vmflag
 Flags affecting the allocation of the span to add.
 .El
 .Sh DESCRIPTION
 The

@@ -51,11 +51,13 @@
 may allocate.
 .Pp
 .Dv VM_SLEEP
 or
 .Dv VM_NOSLEEP
-must be specified, and indicate whether the addition may block.
+must be specified in
+.Fa vmflag ,
+and indicate whether the addition may block.
 .Sh CONTEXT
 This function can be called from either user or kernel context.
 If the
 .Dv VM_NOSLEEP
 flag is specified, it may also be called from interrupt context.