docs: colorize examples

Author: boriel

docs/examples/4inarow.bas.md

@@ -1,11 +1,11 @@
 # 4 in a Row
 
- Program: 4inarow.bas
+## Program: 4inarow.bas
 
  This program first appeared in MicroHobby ZX Spectrum Spanish magazine. It has a
  nice AI in BASIC that plays smartly against the human in only 16Kb!
 
-```
+```basic
    0 REM From MicroHOBBY magazine, Num. 18, page 27  :')
    1 BORDER 1: PAPER 1: INK 7: CLS : PRINT AT 10,10; FLASH 1;"STOP THE TAPE": PAUSE 200
    5 DIM M(8,6): DIM p,pp,n as FLOAT

docs/examples/circle.bas.md

@@ -1,10 +1,9 @@
 # Circle.Bas
 
-```
-Program: circle.bas
-```
+## Program: circle.bas
 
-```
+
+```basic
 REM Sample circle drawing without using the CIRCLE command
 
 DIM i, r, x, y, q as FLOAT

docs/examples/clock.bas.md

@@ -1,9 +1,8 @@
 # Clock.Bas
 
-```
- Program: clock.bas
-```
-```
+## Program: clock.bas
+
+```basic
 REM From the ZX Spectrum MANUAL
 REM A Clock program
 

docs/examples/clock2.bas.md

@@ -1,9 +1,8 @@
 # Clock2.Bas
 
-```
- Program: clock2.bas
-```
-```
+## Program: clock2.bas
+
+```basic
 REM From the ZX Spectrum MANUAL
 REM A Clock program
 

docs/examples/colors.bas.md

@@ -1,9 +1,8 @@
 # Colors.bas
 
-```
- Program: colors.bas
-```
-```
+## Program: colors.bas
+
+```basic
 REM From the ZX Spectrum 48K Manual
 
 DIM m, n, c AS BYTE

docs/examples/fact.bas.md

@@ -1,9 +1,8 @@
 # Fact.bas
 
-```
- Program: fact.bas
-```
-```
+## Program: fact.bas
+
+```vbnet
 REM Factorial recursive test
 
 function fact(x as ulong) as ulong

docs/examples/flag.bas.md

@@ -1,10 +1,8 @@
 # Flag.bas
 
-```
- Program: flag.bas
-```
+## Program: flag.bas
 
-```
+```basic
   5 REM union flag (from the ZX Spectrum Manual)
 
   7 DIM n AS UInteger: REM Needed to avoid overflow at line 530

docs/examples/fractal.bas.md

@@ -1,11 +1,10 @@
 # Fractal.bas
 
-```
-Program: fractal.bas by @Britlion
-```
+## Program: fractal.bas
+by @Britlion
 
 
-```
+```vbnet
 # define width 256
 # define height 192
 

docs/examples/freregustav.bas.md

@@ -1,9 +1,8 @@
 # FrereGustav.bas
 
-```
- Program: freregustav.bas
-```
-```
+## Program: freregustav.bas
+
+```basic
 REM Frere Gustav, from the ZX Spectrum 48K Manual, Chapter 19
 
 PRINT "Frere Gustav"

docs/examples/lines.bas.md

@@ -1,10 +1,8 @@
 # Lines.bas
 
-```
- Program: lines.bas
-```
+## Program: lines.bas
 
-```
+```basic
  5 REM From the ZX Spectrum manual on Drawing primitives
  6 DIM x1, y1, x2, y2, c as Integer