Grammar/Vocabulary fixes

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

laravel/database/schema/grammars/postgres.php

@@ -35,7 +35,7 @@ class Postgres extends Grammar {
 	{
 		$columns = $this->columns($table);
 
-		// Once we the array of column definitions, we need to add "add" to the
+		// Once we have the array of column definitions, we need to add "add" to the
 		// front of each definition, then we'll concatenate the definitions
 		// using commas like normal and generate the SQL.
 		$columns = implode(', ', array_map(function($column)
@@ -246,7 +246,7 @@ class Postgres extends Grammar {
 	}
 
 	/**
-	 * Generate the SQL statement for a drop unqique key command.
+	 * Generate the SQL statement for a drop unique key command.
 	 *
 	 * @param  Table    $table
 	 * @param  Fluent   $command