basicdoc: major doc update

assets/disk0/home/basic/tri.bas

@@ -1,6 +1,10 @@
-10 FOR I = 1 TO 20
-20 PRINT SPC(20-I);
-30 FOR J = 1 TO I*2-1
-40 PRINT "*";
-50 NEXT:PRINT
-60 NEXT
+10 GOTO 1000
+100 REM subroutine to draw a segment. Size is stored to 'Q'
+110 PRINT SPC(20-Q);
+120 FOR Q1=1 TO Q*2-1
+130 PRINT "*";
+140 NEXT : PRINT
+150 RETURN
+1000 FOR Q=1 TO 20
+1010 GOSUB 100
+1020 NEXT