Update setPulseAlpha.markdown

Author: sporkfin

setPulseAlpha.markdown

@@ -4,7 +4,7 @@
 | -------------------- | ---------------------------------------------------------------
 | __Type__             | [function](http://docs.coronalabs.com/api/type/Function.html)
 | __Library__          | [shader.*](README.md)
-| __Pulse Alpha__      | [setPulseAlpha()](setPulseAlpha.markdown), [setPulseAlpha_up()](setPulseAlpha_up.markdown), [setPulseAlpha_down()](setPulseAlpha_down.markdown)
+| __Pulse Alpha__      | [setPulseAlpha_up()](setPulseAlpha_up.markdown), [setPulseAlpha_down()](setPulseAlpha_down.markdown)
 | __Pulse Intensity__  |[setPulseIntensity()](setPulseIntensity.markdown), [setPulseIntensity_up()](setPulseIntensity_up.markdown), [setPulseIntensity_down()](setPulseIntensity_down.markdown)
 | __Pulse zValue__     |[setPulseZValue()](setPulseZValue.markdown), [setPulseZValue_up()](setPulseZValue_up.markdown), [setPulseZValue_down()](setPulseZValue_down.markdown)
 | __Visual Guide__     | [Visual Guide](http://dynamicshader.com/)