Remove all doc references to (dfs_)query_and_fetch

Removes references to (dfs_)query_and_fetch as possible ‘search_type’
parameters for the REST API.

docs/reference/search/request-body.asciidoc

@@ -64,8 +64,8 @@ And here is a sample response:
 `search_type`::
 
     The type of the search operation to perform. Can be
-    `dfs_query_then_fetch`, `dfs_query_and_fetch`, `query_then_fetch`,
-    `query_and_fetch`. Defaults to `query_then_fetch`. See
+    `dfs_query_then_fetch`, `query_then_fetch`, 'count',
+    or 'scan'. Defaults to `query_then_fetch`. See
     <<search-request-search-type,_Search Type_>> for more.
 
 `query_cache`::

docs/reference/search/uri-request.asciidoc

@@ -94,8 +94,8 @@ Defaults to no terminate_after.
 |`size` |The number of hits to return. Defaults to `10`.
 
 |`search_type` |The type of the search operation to perform. Can be
-`dfs_query_then_fetch`, `dfs_query_and_fetch`, `query_then_fetch`,
-`query_and_fetch`, `scan` or `count` deprecated[2.0,Replaced by `size: 0`]. Defaults to `query_then_fetch`. See
+`dfs_query_then_fetch`, `query_then_fetch`, `scan` or `count`
+deprecated[2.0,Replaced by `size: 0`]. Defaults to `query_then_fetch`. See
 <<search-request-search-type,_Search Type_>> for
 more details on the different types of search that can be performed.