Fix mistake about SMP Unicode characters in help

Author: David Kinder

Glulxe/help/revision.htm

@@ -11,7 +11,7 @@ <h1>Revision History</h1>
 <li>Updated to Glulxe 0.5.4, which includes a <a href="debug.htm">debugger</a>,
 and also expands the work-around for games created with old versions of the Superglus
 system to cover more game files.
-<li>Updated to support Glk 0.7.5, which adds character input to graphics windows, clarifies
+<li>Updated to support Glk 0.7.5, which adds character input to graphics windows, clarifies
 the behaviour of zero-size windows, and specifies the encoding of Unicode text files as UTF-8.
 </ul>
 
@@ -24,7 +24,7 @@ <h1>Revision History</h1>
 "Glulxe (no memory checks).exe" executable is no longer needed and has been removed.
 <li>A new configuration file option, "FontFile", allows the game's font to be loaded from
 a font file in the same directory as the game.
-<li>Some of the Unicode characters above $1000 (that is, those in the Supplementary Multilingual
+<li>Some of the Unicode characters above $FFFF (that is, those in the Supplementary Multilingual
 Plane) can now be output, provided that an appropriate font is available.
 <li>Unicode text files are now encoded as UTF-8, as specified in the latest draft of the Glk
 0.7.5 specification.