[css-align-3] Unabbreviate word

Author: fantasai

css-align-3/Overview.bs

@@ -1388,7 +1388,7 @@ Inline-Axis (or Main-Axis) Alignment: the 'justify-self' property</h3>
 
 					(In non-''justify-self/normal'' cases, ''margin/auto'' margins are prioritized over the <a>self-alignment properties</a>, as usual.)
 
-				Note: This somewhat bizarre behavior is required for compat with the behavior specified in CSS 2.1.
+				Note: This somewhat bizarre behavior is required for compatibility with the behavior specified in CSS 2.1.
 		<tr>
 			<th>Other Details
 			<td>
@@ -1556,7 +1556,7 @@ Block-Axis (or Cross-Axis) Alignment: the 'align-self' property</h3>
 
 					(In non-''align-self/normal'' cases, ''margin/auto'' margins are prioritized over the <a>self-alignment properties</a>, as usual.)
 
-				Note: This somewhat bizarre behavior is required for compat with the behavior specified in CSS 2.1.
+				Note: This somewhat bizarre behavior is required for compatibility with the behavior specified in CSS 2.1.
 		<tr>
 			<th>Other Details
 			<td>