Typo in README.md (openvinotoolkit#3191)

### Changes

Corrected typo in Readme

README.md

@@ -474,7 +474,7 @@ conda install -c conda-forge nncf
 System requirements of NNCF correspond to the used backend. System requirements for each backend and
 the matrix of corresponding versions can be found in [installation.md](./docs/Installation.md).
 
-## NNCF Compressed NNCF Model Zoo
+## NNCF Compressed Model Zoo
 
 List of models and compression results for them can be found at our [NNCF Model Zoo page](./docs/ModelZoo.md).