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Clean up the NAME section.

The entries in the NAME section of these man pages have man pages of their
own, so it doesn't make sense to have their names here, instead they
should be just described in the body (similar to what we do in math(3) man page).

This also helps whatis(1) and apropos(1), as otherwise you would see multiple
results with the same name in the output, while there is actually only one page
with that name.

Good example is:

$ apropos -n 2 -M realloc
realloc (3)       general memory allocation operations
realloc (3)       general purpose memory allocation functions

The first line is there because memory(3) man page had realloc in its
NAME section. This commit will fix this issue.

ok wiz@

.\"	$NetBSD: memory.3,v 1.12 2017/04/26 07:40:09 abhinav Exp $
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.\"     from: @(#)memory.3	8.1 (Berkeley) 6/4/93
.\"
.Dd April 26, 2017
.Dt MEMORY 3
.Os
.Sh NAME
.Nm memory
.Nd general memory allocation operations
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In stdlib.h
.Ft void *
.Fn malloc "size_t size"
.Ft void
.Fn free "void *ptr"
.Ft void *
.Fn realloc "void *ptr" "size_t size"
.Ft void *
.Fn calloc "size_t nelem" "size_t elsize"
.Ft void *
.Fn alloca "size_t size"
.Sh DESCRIPTION
These functions allocate and free memory for the calling process.
They are described in the
individual manual pages.
The memory allocators used in the kernel are described in
.Xr memoryallocators 9 .
.Sh SEE ALSO
.Xr alloca 3 ,
.Xr calloc 3 ,
.Xr free 3 ,
.Xr malloc 3 ,
.Xr realloc 3
.Sh STANDARDS
These functions, with the exception of
.Fn alloca
conform to
.St -ansiC .