- Add missing 'the'.

- Document /usr/include/geom/ directory and its subdirectories.

Requested by:	ru

share/man/man7/hier.7

@@ -139,7 +139,7 @@ and
 .Pp
 .Bl -tag -width "geom/" -compact
 .It Pa geom/
-class-specific libraries for
+class-specific libraries for the
 .Xr geom 8
 utility
 .El
@@ -255,6 +255,19 @@ GNU C++ include files
 .It Pa std/
 GNU C++ libstdc++ include files
 .El
+.It Pa geom/
+GEOM framework
+.Bl -tag -width "kerberos5/" -compact
+.It Pa concat/
+CONCAT GEOM class
+.It Pa gate/
+GATE GEOM class
+.It Pa nop/
+NOP GEOM class
+.It Pa stripe/
+STRIPE GEOM class
+.El
+.Pp
 .It Pa isc/
 ISC utility library libisc include files
 .It Pa isofs/