Remove the 'experimental' marking from vector fields. (#49120)

We wrapped up the API changes we wanted to make, and vector fields can now be
considered GA.

docs/reference/mapping/types/dense-vector.asciidoc

@@ -6,8 +6,6 @@
 <titleabbrev>Dense vector</titleabbrev>
 ++++
 
-experimental[]
-
 A `dense_vector` field stores dense vectors of float values.
 The maximum number of dimensions that can be in a vector should
 not exceed 1024. A `dense_vector` field is a single-valued field.
@@ -53,4 +51,4 @@ PUT my_index/_doc/2
 
 Internally, each document's dense vector is encoded as a binary
 doc value. Its size in bytes is equal to
-`4 * dims + 4`, where `dims`—the number of the vector's dimensions.
+`4 * dims + 4`, where `dims`—the number of the vector's dimensions.

docs/reference/vectors/vector-functions.asciidoc

@@ -3,15 +3,11 @@
 [[vector-functions]]
 ===== Functions for vector fields
 
-experimental[]
-
 NOTE: During vector functions' calculation, all matched documents are
 linearly scanned. Thus, expect the query time grow linearly
 with the number of matched documents. For this reason, we recommend
 to limit the number of matched documents with a `query` parameter.
 
-====== `dense_vector` functions
-
 Let's create an index with a `dense_vector` mapping and index a couple
 of documents into it.