readdir.3: Minor tweaks to 'd_name' text

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

man3/readdir.3

@@ -273,13 +273,16 @@ characters preceding the terminating null byte (\(aq\\0\(aq).
 POSIX.1 explicitly notes that this field should not be used as an lvalue.
 The standard also notes that the use of
 .I sizeof(d_name)
-(and by implication
-.IR "sizeof(struct dirent)" )
 is incorrect; use
 .IR strlen(d_name)
 instead.
 (On some systems, this field is defined as 
 .IR char\ d_name[1] !)
+By implication, the use
+.IR "sizeof(struct dirent)"
+to capture the size of record including the size of
+.IR d_name
+is also incorrect.
 
 Note that while the call
 
@@ -290,11 +293,11 @@ on some filesystems (e.g., CIFS, Windows SMB servers),
 the null-terminated filename that is (correctly) returned in
 .I d_name
 can actually exceed this size.
-(In such cases, the
+In such cases, the
 .I d_reclen
 field will contain a value that exceeds the size of the glibc
 .I dirent
-structure shown above.)
+structure shown above.
 .SH SEE ALSO
 .BR getdents (2),
 .BR read (2),