docs, src: fixing man page and usage text readability

docs/dj.1

@@ -15,13 +15,13 @@ dj
 .RB [ -a\ byte ]
 .RB [ -c\ count ]
 
-.RB [ -i\ input_file ]
-.RB [ -b\ input_block_size ]
-.RB [ -s\ input_offset ]
+.RB [ -i\ file ]
+.RB [ -b\ block_size ]
+.RB [ -s\ offset ]
 
-.RB [ -o\ output_file ]
-.RB [ -B\ output_block_size ]
-.RB [ -S\ output_offset ]
+.RB [ -o\ file ]
+.RB [ -B\ block_size ]
+.RB [ -S\ offset ]
 .\"
 .SH DESCRIPTION
 
@@ -39,25 +39,25 @@ immediately subsequent to the specified byte.
 .\"
 .SH OPTIONS
 
-.IP \fB-i\fP
+.IP \fB-i\fP\ \fIfile\fP
 Takes a file path as an argument and opens it for use as an input.
-.IP \fB-b\fP
+.IP \fB-b\fP\ \fIblock_size\fP
 Takes a numeric argument as the size in bytes of the input buffer, the default
 being 1024.
-.IP \fB-s\fP
+.IP \fB-s\fP\ \fIoffset\fP
 Takes a numeric argument as the number of bytes to skip into the input
 before starting to read. If the standard input is used, bytes read to this point
 are discarded.
-.IP \fB-o\fP
+.IP \fB-o\fP\ \fIfile\fP
 Takes a file path as an argument and opens it for use as an output.
-.IP \fB-B\fP
+.IP \fB-B\fP\ \fIblock_size\fP
 Does the same as
 .B -b
 but for the output buffer.
-.IP \fB-S\fP
+.IP \fB-S\fP\ \fIoffset\fP
 Seeks a number of bytes through the output before starting to write from
 the input. If the output is a stream, null characters are printed.
-.IP \fB-a\fP
+.IP \fB-a\fP\ \fIbyte\fP
 Accepts a single literal byte with which the input buffer is padded in the event
 of an incomplete read from the input file.
 .IP \fB-A\fP
@@ -65,7 +65,7 @@ Specifying this option pads the input buffer with null bytes in the event of an
 incomplete read. This is equivalent to specifying
 .B -a
 with a null byte instead of a character.
-.IP \fB-c\fP
+.IP \fB-c\fP\ \fIcount\fP
 Specifies a number of reads to make. The default is 0, in which case the
 input is read until a partial or empty read is made.
 .IP \fB-d\fP