small cosmetic changes

pixelgl/interface.go

@@ -23,7 +23,7 @@ package pixelgl
 //   shader = NewShader(window)
 //   texture = NewTexture(shader)
 //   vertexarray = NewVertexArray(texture)
-//   // now, somewhere else in your code, instead of calling numerous Begin/Ends, you just calling
+//   // now, somewhere else in your code, instead of calling numerous Begin/Ends, you just call
 //   vertexarray.Draw()
 //
 // The final single call to draw a vertex array executes all of the Begins and Ends, because the objects are

pixelgl/thread.go

@@ -1,8 +1,6 @@
 package pixelgl
 
-import (
-	"runtime"
-)
+import "runtime"
 
 // Due to the existance and usage of thread-local variables by OpenGL, it's recommended to
 // execute all OpenGL calls from a single dedicated thread. This file defines functions to make