Created by: baiyfbupt

Add doc:

• paddle.nn.functional.adaptive_avg_pool1d
• paddle.nn.functional.adaptive_max_pool1d
• paddle.nn.functional.avg_pool1d
• paddle.nn.functional.max_pool1d
• paddle.nn.AdaptiveAvgPool1d
• paddle.nn.AdaptiveMaxPool1d
• paddle.nn.AvgPool1d
• paddle.nn.MaxPool1d