basicdoc: major doc update

assets/disk0/home/basic/tri2.bas

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+10 GOTO 1000
+100 REM subroutine to draw a segment. Size is stored to 'Q'
+110 PRINT SPC(20-Q);
+120 Q1=1 : REM loop counter for this subroutine
+130 PRINT "*";
+140 Q1=Q1+1
+150 IF Q1<=Q*2-1 THEN GOTO 130
+160 PRINT : RETURN : REM this line will take us back from the jump
+1000 Q=1 : REM this is our loop counter
+1010 GOSUB 100
+1020 Q=Q+1
+1030 IF Q<=20 THEN GOTO 1010