Update effect.txt

Description fixes:
1. Quick Attack, Shadow Sneak, Aqua Jet, Vacuum Wave, Bullet Punch, Mach Punch and Sucker Punch (Priority level 1)
2. ExtremeSpeed (Priority level 2
3. Add descriptions of Growth and Tail Glow
4. Many fixes of descriptions with two spaces.
Merge pull request #418 from turbedi/patch-4

Update effect.txt