swab.1: fixes formatting

docs/swab.1

@@ -23,9 +23,9 @@ Swap the latter and former halves of a block of bytes.
 .\"
 .SH OPTIONS
 
-.IP -f
+.IP \fB-f\fP
 Ignore system call interruptions.
-.IP -w
+.IP \fB-w\fP
 Configures the word size; that is, the size in bytes of the block size
 on which to operate. By default the word size is 2. The word size must be
 cleanly divisible by 2, otherwise the block of bytes being processed can't be
@@ -33,7 +33,9 @@ halved.
 .\"
 .SH EXAMPLES
 
-The following sh(1p) line:
+The following
+.Br sh (1p)
+line:
 
 .RS
 .R printf 'hello world!\n' | swab
@@ -48,12 +50,16 @@ Produces the following output:
 .SH DIAGNOSTICS
 
 In the event of an error, a debug message will be printed and the program will
-exit with the appropriate sysexits.h(3) error code.
+exit with the appropriate
+.BR sysexits.h (3)
+error code.
 .\"
 .SH RATIONALE
 
 This program was modeled and named after the conv=swab functionality specified
-in the dd(1p) utility. It additionally allows the word size to be configured.
+in the
+.BR dd (1p)
+utility. It additionally allows the word size to be configured.
 
 This functionality is useful for fixing the endianness of binary files produced
 on other machines.