[css-speech-1] Fix typo, quotes.

Author: fantasai

css-speech-1/Overview.bs

@@ -536,14 +536,14 @@ The 'speak-as' property</h3>
 			Spells the text one letter at a time (useful for acronyms and abbreviations).
 			In languages where accented characters are rare,
 			it is permitted to drop accents in favor of alternative unaccented spellings.
-			As as example, in English, the word "r&ocirc;le" can also be written as "role".
-			A conforming implementation would thus be able to spell-out "r&ocirc;le" as "R O L E".
+			As as example, in English, the word “r&ocirc;le” can also be written as “role”.
+			A conforming implementation would thus be able to spell-out “r&ocirc;le” as “R O L E”.
 
 		<dt><dfn>digits</dfn>
 		<dd>
 			Speak numbers one digit at a time,
-			fr instance, "twelve" would be spoken as "one two",
-			and "31" as "three one".
+			for instance, “twelve” would be spoken as “one two”,
+			and “31” as “three one”.
 
 			Note: Speech synthesizers are knowledgeable about what a <em>number</em> is.
 			The 'speak-as' property enables some level of control on how user agents render numbers,