[css-scroll-snap] Convert period to semicolon per lawyers demands. w3c#1305

Author: fantasai

css-scroll-snap/Overview.bs

@@ -841,8 +841,8 @@ Types of Scrolling Methods {#scroll-types}
     An <a>axis-locked</a> scroll is bound to only scroll along that axis.
     This prevents less-precise input mechanisms from drifting in the non-primary axis.
 
-    Note: This specification only applies to scrolling methods supported by the user agent.
-    It does not require the user agent to support any particular input or scrolling method.
+    Note: This specification only applies to scrolling methods supported by the user agent;
+    it does not require the user agent to support any particular input or scrolling method.
 
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