Remove extraneous .br macro before/after .SH/.SS.

man2/madvise.2

@@ -30,7 +30,6 @@
 .SH NAME
 madvise \- give advice about use of memory
 .SH SYNOPSIS
-.br
 .B #include <sys/mman.h>
 .sp
 .BI "int madvise(void *" start ", size_t " length ", int " advice );

man3/getdirentries.3

@@ -28,7 +28,6 @@
 .SH NAME
 getdirentries \- get directory entries in a filesystem independent format
 .SH SYNOPSIS
-.br
 .B #include <dirent.h>
 .sp
 .BI "ssize_t getdirentries(int " fd ", char *" buf ", size_t " nbytes

man3/printf.3

@@ -926,7 +926,6 @@ call to write to memory and creating a security hole.
 .\" Some floating point conversions under early libc4
 .\" caused memory leaks.
 .SH EXAMPLE
-.br
 .if \w'\*(Pi'=0 .ds Pi pi
 To print \*(Pi to five decimal places:
 .in +4n

man3/sigvec.3

@@ -41,7 +41,6 @@ Feature Test Macro Requirements for glibc (see
 .sp
 All functions shown above:
 _BSD_SOURCE
-.br
 .SH DESCRIPTION
 These functions are provided in glibc as a compatibility interface
 for programs that make use of the historical BSD signal API.