docs: Added UNIX V10 Manuals

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+.TH FREAD 3S
+.CT 2 file_io
+.SH NAME
+fread, fwrite \(mi buffered binary input/output
+.SH SYNOPSIS
+.B #include <stdio.h>
+.PP
+.B int fread(ptr, sizeof(*ptr), nitems, stream)
+.br
+.SM
+.B FILE
+.B *stream;
+.PP
+.B int fwrite(ptr, sizeof(*ptr), nitems, stream)
+.br
+.SM
+.B FILE
+.B *stream;
+.SH DESCRIPTION
+.I Fread
+reads from the named input
+.IR stream 
+at most
+.I nitems
+of data of the type of
+.I *ptr
+into a block beginning at
+.I ptr.
+It returns the number of items actually read.
+.PP
+.I Fwrite
+appends to the named output
+.I stream
+at most
+.I nitems
+of data of the type of
+.I *ptr
+from a block beginning at
+.I ptr.
+It returns the number of items actually written.
+.SH "SEE ALSO"
+.IR read (2), 
+.IR stdio (3)
+.SH DIAGNOSTICS
+.I Fread
+and
+.I fwrite
+return 0
+upon end of file or error.
+.SH BUGS
+Write errors of the data for any
+.I fwrite
+call may occur a long time after that call.
+.br
+These routines are much slower than you might imagine.