Remove some documentation that only makes sense with multiple types. (#35066)

* Remove a tip about ignore_above that only makes sense with multiple types.
* Remove a line from the percolator documentation that refers to multiple types.

docs/reference/mapping/params/ignore-above.asciidoc

@@ -49,11 +49,9 @@ GET _search <4>
 <3> This document will be indexed, but without indexing the `message` field.
 <4> Search returns both documents, but only the first is present in the terms aggregation.
 
-TIP: The `ignore_above` setting is allowed to have different settings for
-fields of the same name in the same index.  Its value can be updated on
+TIP: The `ignore_above` setting can be updated on
 existing fields using the <<indices-put-mapping,PUT mapping API>>.
 
-
 This option is also useful for protecting against Lucene's term byte-length
 limit of `32766`.
 

docs/reference/mapping/types/percolator.asciidoc

@@ -55,7 +55,6 @@ PUT my_index/_doc/match_value
 Fields referred to in a percolator query must *already* exist in the mapping
 associated with the index used for percolation. In order to make sure these fields exist,
 add or update a mapping via the <<indices-create-index,create index>> or <<indices-put-mapping,put mapping>> APIs.
-Fields referred in a percolator query may exist in any type of the index containing the `percolator` field type.
 
 =====================================