Replace tiny by small

tiny is not usual html while small is, and probably what was expected.

Author: Arthur-Milchior

index.html

@@ -24,7 +24,7 @@
 			big {
 				font-size: 400%;
 			}
-			tiny {
+			small {
 				font-size: 70%;
 			}
 			.tg {
@@ -79,7 +79,7 @@
 			<img src="images/gitgitgadget-explanation.png" />
 			<big>GitGitGadget</big><br />
 			Contributing git.git patches via GitHub PRs<br />
-			<tiny>... one iteration at a time... </tiny>
+			<small>... one iteration at a time... </small>
 		</div><hr />
 
 		<div class="block">