Update requirements.adoc

Adjusted table column widths to 30,70.

src/docs/asciidoc/jme3/requirements.adoc

@@ -16,7 +16,7 @@ This page shows software and hardware requirements from two points of view:
 == For Developers
 
 These are the minimum requirements for developers who create games using the jMonkeyEngine SDK:
-[cols="2", options="header"]
+[cols="30,70", options="header"]
 |===
 
 a|Operating system
@@ -45,7 +45,7 @@ We recommend using the <<sdk#,jMonkeyEngine SDK>> as game development environmen
 == For Users
 
 These are the minimum requirements for your customers, users who play the games that were created using the jMonkeyEngine3 framework:
-[cols="2", options="header"]
+[cols="30,70", options="header"]
 |===
 
 a|Operating system