Fix kv processor formatting (#9098)

Signed-off-by: Fanit Kolchina <[email protected]>

_ingest-pipelines/processors/kv.md

@@ -85,8 +85,6 @@ To test the pipeline, run the following query:
 
 ```json
 POST _ingest/pipeline/kv-pipeline/_simulate
-
-```json
 {  
   "docs": [  
     {  
@@ -103,7 +101,7 @@ POST _ingest/pipeline/kv-pipeline/_simulate
 
 **Response**
 
-The following example response confirms that the pipeline is working as expected:
+The following example response confirms that, in addition to the original `message` field, the document contains fields generated from key-value pairs:
 
 ```json
 {  
@@ -132,8 +130,6 @@ The following query ingests a document into an index named `testindex1`:
 
 ```json
 PUT testindex1/_doc/1?pipeline=kv-pipeline
-
-```json
 {  
   "message": "goodbye=everybody hello=world"  
 }