notcurses_directmode.3: mention cbreak mode

doc/man/man3/notcurses_directmode.3.md

@@ -77,8 +77,11 @@ ncdirect_init - minimal notcurses instances for styling text
 **ncdirect_init** prepares the **FILE** provided as **fp** (which must
 be attached to a terminal) for colorizing and styling. On success, a pointer to
 a valid **struct ncdirect** is returned. **NULL** is returned on failure.
-Before the process exits, **ncdirect_stop(3)** should be called to reset the
-terminal and free up resources.
+Before the process exits, **ncdirect_stop** should be called to reset the
+terminal and free up resources. **ncdirect_init** places the terminal into
+"cbreak" (also known as "rare") mode, disabling line-buffering and echo of
+input. **ncdirect_stop** restores the terminal state as it was when the
+corresponding **ncdirect_init** call was made.
 
 An appropriate **terminfo(5)** entry must exist for the terminal. This entry is
 usually selected using the value of the **TERM** environment variable (see