[css-align] Spell check.

Author: dbaron

css-align/Overview.bs

@@ -1037,7 +1037,7 @@ Inline/Main-Axis Alignment: the 'justify-self' property</h3>
 				the ''justify-self/normal'' keyword behaves as ''start'' on replaced absolutely-positioned boxes,
 				and behaves as ''justify-self/stretch'' on all other absolutely-positioned boxes.
 
-				If neither offset in thix axis is ''top/auto'',
+				If neither offset in this axis is ''top/auto'',
 				but 'width' ('height', for <a>vertical writing modes</a>) is ''width/auto'',
 				the 'width' ('height') is treated as ''width/stretch''
 				and ''margin/auto'' margins are treated as zero.
@@ -1209,7 +1209,7 @@ Block/Cross-Axis Alignment: the 'align-self' property</h3>
 				the ''align-self/normal'' keyword behaves as ''start'' on replaced absolutely-positioned boxes,
 				and behaves as ''align-self/stretch'' on all other absolutely-positioned boxes.
 
-				If neither offset in thix axis is ''top/auto'',
+				If neither offset in this axis is ''top/auto'',
 				but 'height' ('width', for <a>vertical writing modes</a>) is ''height/auto'',
 				the 'height' ('width') is treated as ''height/stretch''
 				and ''margin/auto'' margins are treated as zero.
@@ -1621,7 +1621,7 @@ Baseline Alignment Terminology</h3>
 		<li>table cells in the same row, along the table's row (inline) axis, established by the row box
 		<li>table cells in the same column, along the table's column (block) axis, established by the column box
 		<li>grid items in the same row, along the grid's row (inline) axis, established by the <a>grid container</a>
-		<li>grid items in the same column, along the grid's colum (block) axis, established by the <a>grid container</a>
+		<li>grid items in the same column, along the grid's column (block) axis, established by the <a>grid container</a>
 		<li>flex items in the same flex line, along the flex container's main axis, established by the <a>flex container</a>
 	</ul>