update pr tmpl (#6552)

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,56 +1,26 @@
-<!--
-Thank you for contributing to LangChain! Your PR will appear in our release under the title you set. Please make sure it highlights your valuable contribution.
-
-Replace this with a description of the change, the issue it fixes (if applicable), and relevant context. List any dependencies required for this change.
-
-After you're done, someone will review your PR. They may suggest improvements. If no one reviews your PR within a few days, feel free to @-mention the same people again, as notifications can get lost.
-
-Finally, we'd love to show appreciation for your contribution - if you'd like us to shout you out on Twitter, please also include your handle!
--->
-
-<!-- Remove if not applicable -->
-
-Fixes # (issue)
-
-#### Before submitting
-
-<!-- If you're adding a new integration, please include:
-
-1. a test for the integration - favor unit tests that does not rely on network access.
-2. an example notebook showing its use
-
-
-See contribution guidelines for more information on how to write tests, lint
-etc:
-
-https://github.com/hwchase17/langchain/blob/master/.github/CONTRIBUTING.md
--->
-
-#### Who can review?
-
-Tag maintainers/contributors who might be interested:
-
-<!-- For a quicker response, figure out the right person to tag with @
-
-  @hwchase17 - project lead
-
-  Tracing / Callbacks
-  - @agola11
-
-  Async
-  - @agola11
-
-  DataLoaders
-  - @eyurtsev
-
-  Models
-  - @hwchase17
-  - @agola11
-
-  Agents / Tools / Toolkits
-  - @hwchase17
-
-  VectorStores / Retrievers / Memory
-  - @dev2049
-
+<!-- Thank you for contributing to LangChain!
+
+Replace this comment with:
+  - Description: a description of the change, 
+  - Issue: the issue # it fixes (if applicable),
+  - Dependencies: any dependencies required for this change,
+  - Tag maintainer: for a quicker response, tag the relevant maintainer (see below),
+  - Twitter handle: we announce bigger features on Twitter. If your PR gets announced and you'd like a mention, we'll gladly shout you out!
+
+If you're adding a new integration, please include:
+  1. a test for the integration, preferably unit tests that do not rely on network access,
+  2. an example notebook showing its use.
+
+Maintainer responsibilities:
+  - General / Misc / if you don't know who to tag: @dev2049
+  - DataLoaders / VectorStores / Retrievers: @rlancemartin, @eyurtsev
+  - Models / Prompts: @hwchase17, @dev2049
+  - Memory: @hwchase17
+  - Agents / Tools / Toolkits: @vowelparrot
+  - Tracing / Callbacks: @agola11
+  - Async: @agola11
+
+If no one reviews your PR within a few days, feel free to @-mention the same people again.
+
+See contribution guidelines for more information on how to write/run tests, lint, etc: https://github.com/hwchase17/langchain/blob/master/.github/CONTRIBUTING.md
  -->