Update Useful-links.html

Fixed some spelling mistakes.

docs/manual/en/introduction/Useful-links.html

@@ -112,7 +112,7 @@
 	 <h2>Tools</h2>
 	 <ul>
 		 <li>
-			[link:http://www.physgl.org/ physgl.org] - javascript front-end with wrappers to three.js, to bring WebGL
+			[link:http://www.physgl.org/ physgl.org] - JavaScript front-end with wrappers to three.js, to bring WebGL
  			graphics to students learning physics and math.
 		 </li>
 		 <li>
@@ -130,7 +130,7 @@
 	<h2>WebGL References</h2>
 	 <ul>
 		 <li>
-			[link:https://www.khronos.org/files/webgl/webgl-reference-card-1_0.pdf] - Reference of all WebGL and GLSL keywords, terminology, syntex and definations.
+			[link:https://www.khronos.org/files/webgl/webgl-reference-card-1_0.pdf] - Reference of all WebGL and GLSL keywords, terminology, syntax and definitions.
 		 </li>
 	 </ul>