[css-speech-1] Bikeshed fix.

Author: fantasai

css-speech-1/Overview.bs

@@ -983,7 +983,7 @@ The 'voice-family' property</h3>
 			in order to improve code clarity.
 			For example: <code>voice-family: "john doe", "Henry	the-8th";</code>
 
-		<dt><dfn><<age>></dfn>
+		<dt><dfn type><<age>></dfn>
 		<dd>
 			Possible values are <dfn>child</dfn>, <dfn>young</dfn> and <dfn>old</dfn>,
 			indicating the preferred age category to match during voice selection.
@@ -992,7 +992,7 @@ 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><<gender>></dfn>
+		<d><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.
@@ -1571,7 +1571,7 @@ The 'voice-duration' property</h3>
 
 		<dt><dfn><<time>></dfn>
 		<dd>
-			Specifies a value in absolute [=time=] units
+			Specifies a value in absolute time units
 			(seconds and milliseconds, e.g. "+3s", "250ms").
 			Only non-negative values are allowed.