select_tut.2: Clarify an ambiguity with respect to select() and EAGAIN

See https://bugzilla.kernel.org/show_bug.cgi?id=196345

Reported-by: Sergey Z. <zhurxx@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

man2/select_tut.2

@@ -395,18 +395,22 @@ The buffers in the example below are 1024 bytes although they could
 easily be made larger.
 .TP
 7.
-The functions
+Calls to
 .BR read (2),
 .BR recv (2),
 .BR write (2),
+.BR send (2),
+and
+.BR select ()
+can fail with the error
+\fBEINTR\fP,
+and calls to
+.BR read (2),
+.BR recv (2)
+.BR write (2),
 and
 .BR send (2)
-as well as the
-.BR select ()
-call can return \-1 with
-.I errno
-set to \fBEINTR\fP,
-or with
+can fail with
 .I errno
 set to \fBEAGAIN\fP (\fBEWOULDBLOCK\fP).
 These results must be properly managed (not done properly above).