[PATCH 26/40] man/curs_add{,_w}ch.3x: Clarify return values.

[G. Branden Robinson]

Also favor "a null pointer" over "NULL"; C23 now has `nullptr`.
---
 man/curs_add_wch.3x | 9 +++++++--
 man/curs_addch.3x   | 9 +++++++--
 2 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/man/curs_add_wch.3x b/man/curs_add_wch.3x
index c5c983055..8825f376e 100644
--- a/man/curs_add_wch.3x
+++ b/man/curs_add_wch.3x
@@ -422,13 +422,18 @@ .SH RETURN VALUE
 .I curses
 screen has not been initialized,
 .bP
+(for functions taking a
+.I \%WINDOW
+pointer argument)
 .I win
-is
-.IR NULL ","
+is a null pointer,
 .bP
 wrapping to a new line is impossible because \fB\%scrollok\fP(3X) has
 not been called on
 .I win
+(or
+.BR stdscr ","
+as applicable)
 when writing to its bottom right location is attempted,
 or
 .bP
diff --git a/man/curs_addch.3x b/man/curs_addch.3x
index c9cdfb790..3522a2db6 100644
--- a/man/curs_addch.3x
+++ b/man/curs_addch.3x
@@ -268,13 +268,18 @@ .SH RETURN VALUE
 .I curses
 screen has not been initialized,
 .bP
+(for functions taking a
+.I \%WINDOW
+pointer argument)
 .I win
-is
-.IR NULL ","
+is a null pointer,
 .bP
 wrapping to a new line is impossible because \fB\%scrollok\fP(3X) has
 not been called on
 .I win
+(or
+.BR stdscr ","
+as applicable)
 when a write to its bottom right location is attempted,
 or
 .bP
-- 
2.30.2

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