[css-speach-1] Malformed DT tag (#5949)

Author: nschonni

css-speech-1/Overview.bs

@@ -988,7 +988,7 @@ The 'voice-family' property</h3>
 			''child'' = 6 y/o, ''young'' = 24 y/o, ''old'' = 75 y/o.
 			More flexible age ranges may be used by the processor-dependent voice-matching algorithm.
 
-		<d><dfn type><<gender>></dfn>
+		<dt><dfn type><<gender>></dfn>
 		<dd>
 			One of the keywords <dfn>male</dfn>, <dfn>female</dfn>, or <dfn>neutral</dfn>,
 			specifying a male, female, or neutral voice, respectively.