Fix doc

_docs/index_tmpl.html

@@ -22,7 +22,7 @@ table.examples td.code pre {
 </style>
 <h1>Ebiten (海老天) v1.0.0-alpha</h1>
 <ul>
-  <li>A simple 2D game library in Go</li>
+  <li>A simple SNES-like 2D game library in Go</li>
   <li>Works on
     <ul>
       <li>Mac OS X</li>

readme.md

@@ -1,6 +1,6 @@
 # Ebiten (海老天) v1.0.0-alpha
 
-* A simple 2D game library in Go
+* A simple SNES-like 2D game library in Go
 * Works on
   * Mac OS X
   * Linux (maybe)

run.go

@@ -26,7 +26,7 @@ import (
 //
 // The given function f is expected to be called 60 times a second,
 // but this is not strictly guaranteed.
-// If you need to care about time, you need to check the current time in f.
+// If you need to care about time, you need to check current time every time f is called.
 func Run(f func(*Image) error, width, height, scale int, title string) error {
 	err := startUI(width, height, scale, title)
 	if err != nil {