[Search] Fix typo in hybrid search example (#472)

Ports elastic/elasticsearch#122430 over to v3

Author: leemthompo

solutions/search/hybrid-semantic-text.md

@@ -27,7 +27,7 @@ PUT semantic-embeddings
   "mappings": {
     "properties": {
       "semantic_text": { <1>
-        "type": "semantic_text",
+        "type": "semantic_text"
       },
       "content": { <2>
         "type": "text",