docs: fix import in the example code: ContextRelevance -> ContextRele…

…vancy (#646)

## **Description**
- Fixed an incorrect import statement in the context relevancy example
code within the documentation.
- Ensured the file ends with a newline character.

docs/concepts/metrics/context_relevancy.md

@@ -24,8 +24,8 @@ Low context relevancy: France, in Western Europe, encompasses medieval cities, a
 
 ```{code-block} python
 :caption: Context relevancy
-from ragas.metrics import ContextRelevance
-context_relevancy = ContextRelevance()
+from ragas.metrics import ContextRelevancy
+context_relevancy = ContextRelevancy()
 
 
 # Dataset({
@@ -35,4 +35,4 @@ context_relevancy = ContextRelevance()
 dataset: Dataset
 
 results = context_relevancy.score(dataset)
-```
+```