docs: fix retriever typos (#31733)

Author: MichaelLi65535

docs/docs/concepts/retrievers.mdx

@@ -68,8 +68,8 @@ For example, you can build a retriever for a SQL database using text-to-SQL conv
 
 :::info[Further reading]
 
-* See our [tutorial](/docs/tutorials/sql_qa/) for context on how to build a retreiver using a SQL database and text-to-SQL.
-* See our [tutorial](/docs/tutorials/graph/) for context on how to build a retreiver using a graph database and text-to-Cypher.
+* See our [tutorial](/docs/tutorials/sql_qa/) for context on how to build a retriever using a SQL database and text-to-SQL.
+* See our [tutorial](/docs/tutorials/graph/) for context on how to build a retriever using a graph database and text-to-Cypher.
 
 :::
 

docs/docs/integrations/tools/vectara.ipynb

@@ -238,7 +238,7 @@
    "id": "b651396a-5726-4d49-bacf-c9d7a5ddcf7a",
    "metadata": {},
    "source": [
-    "## Vectara as a langchain retreiver\n",
+    "## Vectara as a langchain retriever\n",
     "\n",
     "The `VectaraSearch` tool can be used just as a retriever. \n",
     "\n",

docs/docs/integrations/vectorstores/vectara.ipynb

@@ -274,7 +274,7 @@
    "id": "b651396a-5726-4d49-bacf-c9d7a5ddcf7a",
    "metadata": {},
    "source": [
-    "## Vectara as a langchain retreiver\n",
+    "## Vectara as a langchain retriever\n",
     "\n",
     "The Vectara component can also be used just as a retriever. \n",
     "\n",