docs: improved vectorstore notebooks (#3724)

- Added links to the vectorstore providers
- Added installation code (it is not clear that we have to go to the
`LangChan Ecosystem` page to get installation instructions.)

docs/modules/indexes/vectorstores/examples/annoy.ipynb

@@ -1,34 +1,31 @@
 {
  "cells": [
   {
-   "attachments": {},
    "cell_type": "markdown",
    "id": "683953b3",
    "metadata": {},
    "source": [
     "# Annoy\n",
     "\n",
-    "This notebook shows how to use functionality related to the Annoy vector database.\n",
-    "\n",
     "> \"Annoy (Approximate Nearest Neighbors Oh Yeah) is a C++ library with Python bindings to search for points in space that are close to a given query point. It also creates large read-only file-based data structures that are mmapped into memory so that many processes may share the same data.\"\n",
     "\n",
+    "This notebook shows how to use functionality related to the `Annoy` vector database.\n",
+    "\n",
     "via [Annoy](https://github.com/spotify/annoy) \n"
    ]
   },
   {
-   "attachments": {},
    "cell_type": "markdown",
    "id": "3b450bdc",
    "metadata": {},
    "source": [
     "```{note}\n",
-    "Annoy is read-only - once the index is built you cannot add any more emebddings!\n",
-    "If you want to progressively add to your VectorStore then better choose an alternative!\n",
+    "NOTE: Annoy is read-only - once the index is built you cannot add any more emebddings!\n",
+    "If you want to progressively add new entries to your VectorStore then better choose an alternative!\n",
     "```"
    ]
   },
   {
-   "attachments": {},
    "cell_type": "markdown",
    "id": "6613d222",
    "metadata": {},
@@ -123,7 +120,6 @@
    ]
   },
   {
-   "attachments": {},
    "cell_type": "markdown",
    "id": "4583b231",
    "metadata": {},
@@ -265,7 +261,6 @@
    ]
   },
   {
-   "attachments": {},
    "cell_type": "markdown",
    "id": "341390c2",
    "metadata": {},
@@ -409,7 +404,6 @@
    ]
   },
   {
-   "attachments": {},
    "cell_type": "markdown",
    "id": "6f570f69",
    "metadata": {},
@@ -472,7 +466,6 @@
    ]
   },
   {
-   "attachments": {},
    "cell_type": "markdown",
    "id": "df4beb83",
    "metadata": {},
@@ -564,7 +557,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.16"
+   "version": "3.10.6"
   }
  },
  "nbformat": 4,