Fix reversed semantics of sample_state READ/NOT_READ (#1201) (#1205)

(cherry picked from commit 0f6abc0)

Signed-off-by: xiaoyang04 <xiaoyang04@megvii.com>
Co-authored-by: xiao-yang25 <xy1453417528@gmail.com>

Author: mergify[bot]

docs/fastdds/dds_layer/subscriber/sampleInfo/sampleInfo.rst

@@ -43,8 +43,8 @@ sample_state
 been read previously.
 It can take one of these values:
 
-* **READ**: This is the first time this data sample has been retrieved.
-* **NOT_READ**: The data sample has already been *read* or *taken* previously.
+* **READ**: The data sample has already been *read* or *taken* previously.
+* **NOT_READ**: This is the first time this data sample has been retrieved.
 
 .. _dds_layer_subscriber_sampleInfo_viewstate: