Grammar/Vocabulary fixes

Signed-off-by: Chris Berthe <chrisberthe@gmail.com>

laravel/database/query/grammars/sqlserver.php

@@ -95,7 +95,7 @@ class SQLServer extends Grammar {
 
 		// Next we need to calculate the constraint that should be placed on
 		// the row number to get the correct offset and limit on the query.
-		// If there is not limit, we'll just handle the offset.
+		// If there is not a limit, we'll just handle the offset.
 		if ($query->limit > 0)
 		{
 			$finish = $query->offset + $query->limit;