remove subsection designations

remove subsection designations

SCCS-vsn: lib/libc/stdio/ferror.3 6.4
SCCS-vsn: lib/libc/stdio/fopen.3 6.4
SCCS-vsn: lib/libc/stdio/fread.3 6.2
SCCS-vsn: lib/libc/stdio/fseek.3 6.5
SCCS-vsn: lib/libc/stdio/getc.3 6.3
SCCS-vsn: lib/libc/stdio/fgets.3 6.2
SCCS-vsn: lib/libc/stdio/gets.3 6.2
SCCS-vsn: lib/libc/stdio/printf.3 6.6
SCCS-vsn: lib/libc/stdio/putc.3 6.3
SCCS-vsn: lib/libc/stdio/fputs.3 6.2
SCCS-vsn: lib/libc/stdio/scanf.3 6.2
SCCS-vsn: lib/libc/stdio/setbuf.3 6.4
SCCS-vsn: lib/libc/stdio/ungetc.3 6.2