Regenerate snippet .md files

Run `./generate-md.py` to update generated markdown files after
semi-manual changes made in the previous commit.
This commit serves as a gist of fixed issues found in snippets.

(it's easier to review 250 lines diff rather than 31k lines diff, isn't it?)

qdrant-landing/content/documentation/headless/snippets/create-payload-index/stemmer-full-text/generated/python.md

@@ -7,7 +7,7 @@ client.create_payload_index(
     collection_name="{collection_name}",
     field_name="name_of_the_field_to_index",
     field_schema=models.TextIndexParams(
-        type="text",
+        type=models.TextIndexType.TEXT,
         tokenizer=models.TokenizerType.WORD,
         stemmer=models.SnowballParams(
             type=models.Snowball.SNOWBALL,