add some mandoc pages and fix some warnings

- add .Os, it is mandatory.
- don't redeclare .Nm when it's not needed.
- fix some warnings (checked with mandoc -Tlint).
- remove some leftover old stuff.

wc.1

@@ -1,25 +1,27 @@
-.TH WC 1 sbase\-VERSION
-.SH NAME
-wc \- word count
-.SH SYNOPSIS
-.B wc
-.RB [ \-clmw ]
-.RI [ file ...]
-.SH DESCRIPTION
-.B wc
+.Dd January 30, 2015
+.Dt WC 1 sbase\-VERSION
+.Os
+.Sh NAME
+.Nm wc
+.Nd word count
+.Sh SYNOPSIS
+.Nm
+.Op Fl clmw
+.Op Ar file ...
+.Sh DESCRIPTION
+.Nm
+.Pp
 prints the number of lines, words, and bytes in each file.  If any flags are
 given, wc will print only the requested information.  If no files are given, wc
 reads stdin.
-.SH OPTIONS
-.TP
-.B \-c
+.Sh OPTIONS
+.Bl -tag -width Ds
+.It Fl c
 print the number of bytes.
-.TP
-.B \-l
+.It Fl l
 print the number of lines.
-.TP
-.B \-m
+.It Fl m
 print the number of characters, not bytes.
-.TP
-.B \-w
+.It Fl w
 print the number of words.
+.El