Fixed lint issues & cleaned up some documentation.

glow/src/shader/common/gradient.frag

@@ -47,4 +47,4 @@ void main() {
             fragColor = color_stops[color_stops_size - 2];
         }
     }
-}
+}

glow/src/shader/common/triangle.frag

@@ -15,4 +15,4 @@ uniform vec4 color;
 
 void main() {
     fragColor = color;
-}
+}

glow/src/shader/common/triangle.vert

@@ -6,4 +6,4 @@ out vec2 raw_position;
 void main() {
     gl_Position = u_Transform * vec4(i_Position, 0.0, 1.0);
     raw_position = i_Position;
-}
+}