dj.1: update man page to match behavior

docs/dj.1

@@ -42,9 +42,9 @@ byte onwards. A programmer may think of a file as a zero-indexed array of
 bytes; in this analogy, the offset given is the index of the byte at which to
 start reading or writing.
 
-Seeks and skips aren\(cqt counted in the output statistics because they're
+Seeks aren\(cqt counted in the output statistics because they\(cqre guaranteed
-guaranteed to succeed (or the utility will exit unsuccessfully, before it has
+to succeed (or the utility will exit unsuccessfully, before it has written any
-written any data).
+data).
 .\"
 .SH OPTIONS
 
@@ -185,9 +185,19 @@ option is specified, this could make written data nonsensical.
 
 Existing files are not truncated on ouput and are instead overwritten.
 
-Many lowercase options have capitalized variants and vice-versa which can be
+The options
-confusing. Capitalized options tend to affect output or are more intense
+.B -b
-versions of lowercase options.
+and
+.B -B
+could be confused for each other, and so could
+.B -s
+and
+.BR -S .
+The lowercase option affects input and the capitalized option affects output.
+
+The discarded but read bytes skipped while processing irregular files, such as
+streams, are reported in the diagnostic output. Bytes skipped while processing
+regular files are not reported, as the bytes weren\(cqt read.
 .\"
 .SH RATIONALE
 
@@ -208,3 +218,4 @@ Copyright \(co 2023 DTB. License AGPLv3+: GNU AGPL version 3 or later
 .\"
 .SH SEE ALSO
 .BR dd (1p)
+.BR lseek (3p)