dj.1, strcmp.1, swab.1: remove nonexistent roff macros

docs/dj.1

@@ -18,30 +18,18 @@ dj
 .RB [ count ])
 
 .RB ( -i
-.R [
-.B input file
-.R ])
+[\fBinput file\fP])
 .RB ( -b
-.R [
-.B input block size
-.R ])
+[\fBinput block size\fP])
 .RB ( -s
-.R [
-.B input offset
-.R ])
+[\fBinput offset\fP])
 
 .RB ( -o
-.R [
-.B output file
-.R ])
+[\fBoutput file\fP])
 .RB ( -B
-.R [
-.B output block size
-.R ])
+[\fBoutput block size\fP])
 .RB ( -S
-.R [
-.B output offset
-.R ])
+[\fBoutput offset\fP])
 .\"
 .SH DESCRIPTION
 
@@ -118,10 +106,10 @@ By default, statistics are printed for input and output to the standard error in
 the following format:
 
 .RS
-.R {records read} {ASCII unit separator} {partial records read}
-.R {ASCII record separator} {records written} {ASCII unit separator}
-.R {partial records written} {ASCII group separator} {bytes read}
-.R {ASCII record separator} {bytes written} {ASCII file separator}
+{records read} {ASCII unit separator} {partial records read}
+{ASCII record separator} {records written} {ASCII unit separator}
+{partial records written} {ASCII group separator} {bytes read}
+{ASCII record separator} {bytes written} {ASCII file separator}
 .RE
 
 This format for diagnostic output is designed to be machine-parseable for
@@ -130,9 +118,9 @@ convenience. For a more human-readable format, the
 option may be specified. In this event, the following format is used instead:
 
 .RS
-.R {records read} '+' {partial records read} '>' {records written}
-.R '+' {partial records written} ';' {bytes read} '>' {bytes written}
-.R {ASCII line feed}
+{records read} '+' {partial records read} '>' {records written}
+'+' {partial records written} ';' {bytes read} '>' {bytes written}
+{ASCII line feed}
 .RE
 
 If the
@@ -144,9 +132,9 @@ was invoked. The following example is the result of running the program with
 as the only argument:
 
 .RS
-.R argv0=dj
-.R in=<stdin>      ibs=1024        skip=0  align=ff       count=0
-.R out=<stdout>    obs=1024        seek=0  debug= 3       noerror=0
+argv0=dj
+in=<stdin>      ibs=1024        skip=0  align=ff       count=0
+out=<stdout>    obs=1024        seek=0  debug= 3       noerror=0
 .RE
 
 In non-recoverable errors that don\(cqt pertain to the read-write cycle, a

docs/strcmp.1

@@ -25,14 +25,14 @@ will exit with an error code of 1 if a string passed has a lesser byte value
 than one of the prior strings:
 
 .RS
-.R strcmp b a
+strcmp b a
 .RE
 
 and with an error code of 255 if it has a greater byte value than one of the
 prior strings:
 
 .RS
-.R strcmp a b
+strcmp a b
 .RE
 
 When invoked incorrectly, a debug message will be printed and the program will

docs/swab.1

@@ -38,13 +38,13 @@ The following
 line:
 
 .RS
-.R printf 'hello world!\(rsn' | swab
+printf 'hello world!\(rsn' | swab
 .RE
 
 Produces the following output:
 
 .RS
-.R ehll oowlr!d
+ehll oowlr!d
 .RE
 .\"
 .SH DIAGNOSTICS