Update README.md (openvinotoolkit#962)

quick fixes on typo.

Author: raymondlo84

notebooks/230-yolov8-optimization/README.md

@@ -17,10 +17,10 @@ The tutorial consists of the following steps:
 - Validate the original model.
 - Convert the PyTorch model to OpenVINO IR.
 - Validate the converted model.
-- Prepare and run NNCF Postraining optimization pipeline.
+- Prepare and run NNCF post-training optimization pipeline.
 - Compare accuracy of the FP32 and quantized models.
 - Compare performance of the FP32 and quantized models.
 
 ## Installation Instructions
 
-If you have not installed all required dependencies, follow the [Installation Guide](../../README.md).
+If you have not installed all required dependencies, follow the [Installation Guide](../../README.md).