docs: Update old imports (#7951)

Author: jacoblee93

docs/core_docs/docs/integrations/platforms/google.mdx

@@ -212,7 +212,7 @@ PaLM models are no longer supported.
 > referred to as vector similarity-matching or an approximate nearest neighbor (ANN) service.
 
 ```typescript
-import { MatchingEngine } from "langchain/vectorstores/googlevertexai";
+import { MatchingEngine } from "@langchain/community/vectorstores/googlevertexai";
 ```
 
 ### Postgres Vector Store
@@ -279,7 +279,7 @@ const vectorStore = await PostgresVectorStore.initialize(
 There exists a `GoogleCustomSearch` utility which wraps this API. To import this utility:
 
 ```typescript
-import { GoogleCustomSearch } from "langchain/tools";
+import { GoogleCustomSearch } from "@langchain/community/tools/google_custom_search";
 ```
 
 We can easily load this wrapper as a Tool (to use with an Agent). We can do this with:

docs/core_docs/docs/integrations/vectorstores/googlevertexai.mdx

@@ -147,7 +147,7 @@ set for the document. So if we just wanted to limit the results to those
 with a red color, we can do:
 
 ```typescript
-import { Restriction } from `langchain/vectorstores/googlevertexai`;
+import { Restriction } from `@langchain/community/vectorstores/googlevertexai`;
 
 const redFilter: Restriction[] = [
   {
@@ -180,7 +180,7 @@ const results = await engine.similaritySearch("this", 4, filter);
 Deleting documents are done using ID.
 
 ```typescript
-import { IdDocument } from `langchain/vectorstores/googlevertexai`;
+import { IdDocument } from `@langchain/community/vectorstores/googlevertexai`;
 
 const oldResults: IdDocument[] = await engine.similaritySearch("this", 10);
 const oldIds = oldResults.map( doc => doc.id! );