[PATCH 17/23] Document "SP" symbol.

[G. Branden Robinson]

It had no description.  Demote "NOTES" section to new subsection (of
"DESCRIPTION") "terminfo and curses".  Characterize `SP` as the bridge
between the lower-level terminfo API and the higher-level curses one.
---
 man/term_variables.3x | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/man/term_variables.3x b/man/term_variables.3x
index 6aee63f48..dea9b6a65 100644
--- a/man/term_variables.3x
+++ b/man/term_variables.3x
@@ -156,11 +156,24 @@ .SS "\fIterminfo\fP Names"
 but each terminfo library provides these long names defined to point
 into the current terminal description loaded into memory.
 .\"
-.SH NOTES
-The low-level terminfo interface is initialized using
-\fB\%setupterm\fP(3X).
-The upper-level curses interface uses the low-level terminfo interface,
-internally.
+.SS "\fIterminfo\fP and \fIcurses"
+\fB\%setupterm\fP(3X) initializes the lower-level
+.I \%term\%info
+interface.
+The higher-level
+.I curses
+interface uses the
+.I \%term\%info
+interface internally;
+the symbol
+.B SP
+bridges the
+.I curses
+.I SCREEN
+type with the
+.I \%term\%info
+.I TERMINAL
+type.
 .\"
 .SH PORTABILITY
 X/Open Curses does not describe any of these except for \fBcur_term\fP.
-- 
2.30.2

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