Fix grammar in Vector Memory Docs (#2847)

docs/modules/memory/types/vectorstore_retriever_memory.ipynb

@@ -1,15 +1,16 @@
 {
  "cells": [
   {
+   "attachments": {},
    "cell_type": "markdown",
    "id": "ff4be5f3",
    "metadata": {},
    "source": [
     "# VectorStore-Backed Memory\n",
     "\n",
-    "`VectorStoreRetrieverMemory` stores interactions in a VectorDB and queries the top-K most \"salient\" interactions every type it is called.\n",
+    "`VectorStoreRetrieverMemory` stores memories in a VectorDB and queries the top-K most \"salient\" docs every time it is called.\n",
     "\n",
-    "This differs from most of the other Memory classes in that "
+    "This differs from most of the other Memory classes in that it doesn't explicitly track the order of interactions."
    ]
   },
   {
@@ -60,13 +61,14 @@
    ]
   },
   {
+   "attachments": {},
    "cell_type": "markdown",
    "id": "8f4bdf92",
    "metadata": {},
    "source": [
     "### Create your the VectorStoreRetrieverMemory\n",
     "\n",
-    "The memory object is instantiated from "
+    "The memory object is instantiated from any VectorStoreRetriever."
    ]
   },
   {