man: Fix documentation for package flags

The “reinstreq” flag was mispelled, and the “ok” flag was missing.

debian/changelog

@@ -59,6 +59,7 @@ dpkg (1.18.5) UNRELEASED; urgency=medium
       Closes: #811267
     - Clarify that packages are only automatically forgotten by dpkg if they
       contain no user data, such as package selections. Closes: #813179
+    - Fix documentation for package flags in dpkg(1).
 
   [ Updated programs translations ]
   * Portuguese (Miguel Figueiredo).

man/dpkg.1

@@ -106,8 +106,12 @@ The package is selected to be purged (i.e. we want to remove everything
 from system directories, even configuration files).
 .SS Package flags
 .TP
-.B reinst\-required
-A package marked \fBreinst\-required\fP is broken and requires
+.B ok
+A package marked \fBok\fP is in a known state, but might need further
+processing.
+.TP
+.B reinstreq
+A package marked \fBreinstreq\fP is broken and requires
 reinstallation. These packages cannot be removed, unless forced with
 option \fB\-\-force\-remove\-reinstreq\fP.
 .