Change anchor name for 'High Scores Saving' section

Some browsers treat anchor names case-sensitively. The anchor name for
the 'High Scores Saving' section has a lower case 'S' meaning that the
links to that section do not work. This patch chages the anchor name
from "Highscores" to "HighScores"

docs/index.html

@@ -2526,7 +2526,7 @@ <h2><b><a name="ControlMap">Controller Map</a></b></h2>
 
   <br>
   <p><h2>
-  <a name="Highscores">High Scores Saving</a></h2>
+  <a name="HighScores">High Scores Saving</a></h2>
   <blockquote>
 
   <p>Stella allows the user to save high scores when the required definitions