Convert nng_clock and nng_msleep docs to mdbook

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diff --git a/docs/ref/api/util/nng_msleep.md b/docs/ref/api/util/nng_msleep.md
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+# nng_msleep
+
+## NAME
+
+nng_msleep --- sleep milliseconds
+
+## SYNOPSIS
+
+```c
+#include <nng/nng.h>
+
+typedef int64_t nng_duration;
+
+void nng_msleep(nng_duration msec);
+```
+
+## DESCRIPTION
+
+The `nng_msleep()` blocks the caller for at least _msec_ milliseconds.
+
+> [!NOTE]
+> This function may block for longer than requested.
+> The actual wait time is determined by the capabilities of the
+> underlying system.
+
+## SEE ALSO
+
+[nng_sleep_aio][nng_sleep_aio],
+[nng_clock][nng_clock]
+
+[nng_clock]: ../util/nng_clock.md
+[nng_sleep_aio]: ../aio/nng_sleep_aio.md