[docs] update outdated info & fix typo

include/notcurses/nckeys.h

@@ -11,7 +11,7 @@ extern "C" {
 
 // Rather than using one of the Private Use Areas of Unicode, we use the area
 // beyond the 17 65536-entry Planes (1114112). We round up to 5000 so that it's
-// trivial to idenfity synthesized characters based on their numeric definition
+// trivial to identify synthesized characters based on their numeric definition
 // here. This is safe, since we needn't convert these synthesized characters
 // into UTF8 (they would otherwise require more than four bytes).
 #define PRETERUNICODEBASE 1115000

include/notcurses/notcurses.h

@@ -1054,8 +1054,8 @@ API void notcurses_drop_planes(struct notcurses* nc)
 // Unicode codepoint, *not* an entire Extended Grapheme Cluster. It is also
 // possible that we will read a special keypress, i.e. anything that doesn't
 // correspond to a Unicode codepoint (e.g. arrow keys, function keys, screen
-// resize events, etc.). These are mapped into Unicode's Supplementary
-// Private Use Area-B, starting at U+100000. See <notcurses/nckeys.h>.
+// resize events, etc.). These are mapped into a Unicode's area beyond the
+// 17 65536-entry Planes, starting at U+1115000. See <notcurses/nckeys.h>.
 //
 // notcurses_get_nblock() is nonblocking. notcurses_get_blocking() blocks
 // until a codepoint or special key is read, or until interrupted by a signal.