Convert nng_clock and nng_msleep docs to mdbook

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+# nng_clock
+
+## NAME
+
+nng_clock - get time
+
+## SYNOPSIS
+
+```c
+#include <nng/nng.h>
+
+typedef uint64_t nng_time;
+
+nng_time nng_clock(void);
+```
+
+## DESCRIPTION
+
+The `nng_clock` function returns the number of elapsed milliseconds since some
+arbitrary time in the past.
+The resolution of the clock depends on the underlying timing facilities
+of the system.
+This function may be used for timing, but applications should not expect
+very fine-grained values.
+
+> [!NOTE]
+> The reference time will be the same for a given program,
+> but different programs may have different references.
+
+This function is intended to help with setting appropriate
+timeouts using [`nng_cv_until`][nng_cv_until]
+or [`nng_aio_set_expire`][nng_aio_set_timeout].
+
+## RETURN VALUES
+
+Milliseconds since reference time.
+
+## SEE ALSO
+
+[nng_cv_until][nng_cv_until],
+[nng_msleep][nng_msleep],
+[nng_sleep_aio][nng_sleep_aio]
+
+[nng_cv_until]: ../thr/nng_cv.md
+[nng_msleep]: ../util/nng_msleep.md
+[nng_sleep_aio]: ../aio/nng_sleep_aio.md
+[nng_aio_set_timeout]: ../aio/nng_aio_set_timeout.md