[css-text-3] Fix Typo

Author: frivoal

css-text-3/Overview.bs

@@ -2154,7 +2154,7 @@ Line Breaking Details</h3>
 
     <p>Hyphenation occurs when the line breaks at a valid <dfn>hyphenation opportunity</dfn>,
       which creates a <a>soft wrap opportunity</a> within the word
-      where a visually indication of the split is made when actually wrapping,
+      where a visual indication of the split is made when actually wrapping,
       as discussed above.
       In CSS it is controlled with the 'hyphens' property.
       CSS Text Level 3 does not define the exact rules for hyphenation,