docs: consolidate misc chapter

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diff --git a/docs/ref/api/util/nng_socket_pair.md b/docs/ref/api/util/nng_socket_pair.md
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-# nng_socket_pair
-
-## NAME
-
-nng_socket_pair --- create a connected pair of BSD sockets
-
-## SYNOPSIS
-
-```c
-#include <nng/nng.h>
-
-int nng_socket_pair(int fds[2]);
-```
-
-## DESCRIPTION
-
-The `nng_socket_pair` function creates a pair of connected BSD sockets.
-These sockets, which are returned in the _fds_ array, are suitable for
-use with the [BSD socket transport][socket].
-
-On POSIX platforms, this is a thin wrapper around the standard `socketpair` function,
-using the {{i:`AF_UNIX`}} family and the `SOCK_STREAM` socket type.
-{{footnote: At present only POSIX platforms implementing `socketpair` support this function.}}
-
-> [!TIP]
-> This function may be useful for creating a shared connection between a parent process and
-> a child process on UNIX platforms, without requiring the processes use a shared filesystem or TCP connection.
-
-## RETURN VALUES
-
-This function returns 0 on success, and non-zero otherwise.
-
-## ERRORS
-
-- `NNG_ENOMEM`: Insufficient memory exists.
-- `NNG_ENOTSUP`: This platform does not support socket pairs.
-
-## SEE ALSO
-
-[BSD Socket Transport][socket]
-
-[socket]: ../../tran/socket.md