Fix error in docs code snippet (#121187)

Author: kderusso

docs/reference/mapping/types/semantic-text.asciidoc

@@ -130,7 +130,7 @@ You can extract the most relevant fragments from a semantic text field by using
 
 [source,console]
 ------------------------------------------------------------
-PUT test-index
+POST test-index/_search
 {
     "query": {
         "semantic": {
@@ -240,4 +240,4 @@ PUT test-index
 `semantic_text` field types have the following limitations:
 
 * `semantic_text` fields are not currently supported as elements of <<nested,nested fields>>.
-* `semantic_text` fields can't currently be set as part of <<dynamic-templates>>.
+* `semantic_text` fields can't currently be set as part of <<dynamic-templates>>.