docs: add memory chapter

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diff --git a/docs/ref/api/util/nng_alloc.md b/docs/ref/api/util/nng_alloc.md
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-# nng_alloc
-
-## NAME
-
-nng_alloc --- allocate memory
-
-## SYNOPSIS
-
-```c
-#include <nng/nng.h>
-
-void *nng_alloc(size_t size);
-void nng_free(void *ptr, size_t size);
-```
-
-## DESCRIPTION
-
-The {{i:`nng_alloc`}} function allocates a contiguous memory region of
-at least _size_ bytes.
-The memory will be 64-bit aligned.
-
-The {{i:`nng_free`}} function deallocates {{i:memory}} previously allocated by `nng_alloc`.
-
-Memory returned by `nng_alloc` can be used to hold message buffers, in which
-case it can be directly passed to [`nng_send`][nng_send] using the flag `NNG_FLAG_ALLOC`.
-Alternatively, it can be freed when no longer needed using `nng_free`.
-
-> [!IMPORTANT]
-> Do not use the system `free` function (or the C++ `delete` operator) to release this memory.
-> On some configurations this may work, but on others it will lead to a crash or
-> other unpredictable behavior.
-
-## RETURN VALUES
-
-The `nng_alloc` function returns a pointer to the allocated memory on success,
-and `NULL` otherwise.
-
-## ERRORS
-
-No errors are returned, but if memory cannot be allocated then `NULL` is returned.
-This can reasonably be treated as if an `NNG_ENOMEM` error occurred.
-
-## SEE ALSO
-
-[nng_send][nng_send]
-
-[nng_send]: [TODO.md]