mandoc -Tlint reveals that some of the Pp and Ns are skipped anyway. Reword slightly to get rid of the parantheses that required the Ns in the first place.
Index: libc/net/getrrsetbyname.3 =================================================================== RCS file: /cvs/src/lib/libc/net/getrrsetbyname.3,v retrieving revision 1.16 diff -u -p -r1.16 getrrsetbyname.3 --- libc/net/getrrsetbyname.3 5 Jun 2013 03:39:23 -0000 1.16 +++ libc/net/getrrsetbyname.3 16 Jul 2013 09:08:17 -0000 @@ -123,7 +123,6 @@ will request DNSSEC authentication using .Fn getrrsetbyname returns zero on success, and one of the following error codes if an error occurred: -.Pp .Bl -tag -width ERRSET_NOMEMORY .It Bq Er ERRSET_NONAME The name does not exist. Index: libkeynote/keynote.4 =================================================================== RCS file: /cvs/src/lib/libkeynote/keynote.4,v retrieving revision 1.30 diff -u -p -r1.30 keynote.4 --- libkeynote/keynote.4 27 Sep 2012 11:31:58 -0000 1.30 +++ libkeynote/keynote.4 16 Jul 2013 09:08:18 -0000 @@ -672,9 +672,7 @@ expression has the higher-order (maximum .It A .Qo -.Ao K -.Ac Ns -of Ns Po Aq List -.Pc +.Ao K Ac Ns -of Ns Pq Aq List .Qc expression has the K-th highest order compliance value listed in .Aq list . Index: libkeynote/keynote.5 =================================================================== RCS file: /cvs/src/lib/libkeynote/keynote.5,v retrieving revision 1.21 diff -u -p -r1.21 keynote.5 --- libkeynote/keynote.5 27 Sep 2012 11:31:58 -0000 1.21 +++ libkeynote/keynote.5 16 Jul 2013 09:08:18 -0000 @@ -103,12 +103,12 @@ double-quote character (ASCII 34 decimal A printable character may be .Sq escaped inside a quoted string literal by preceding it with the backslash -character (ASCII 92 decimal) (e.g., +character (ASCII 92 decimal), e.g., .Qo like \& .No \e Ns Qo this Ns \e .Qc . .\".Pf { Qo mike Ns Qc 12 -.Qc Ns ). +.Qc . This permits the inclusion of the double-quote and backslash characters inside string literals. .Pp @@ -334,11 +334,8 @@ structured format (e.g., PKCS1 and key bit encoding (e.g., HEX or BASE64). By convention, the ALGORITHM substring starts with an alphabetic character and can contain letters, -digits, underscores, or dashes (i.e., it should match the regular expression -.Qo Ns Bo a-zA-Z -.Bc Ns Bo a-zA-Z0-9_- -.Bc Ns * -.Qc Ns ) . +digits, underscores, or dashes; i.e., it should match the regular expression +.Qo Ns Bo a-zA-Z Bc Ns Bo a-zA-Z0-9_- Bc Ns * Qc . The IANA (or some other appropriate authority) will provide a registry of reserved algorithm identifiers. .Pp