Quick update to README re: list endpoint (#293)

## Problem

It's often unclear to users that the `list` endpoint (i.e. query by
vector ID) does not necessarily return the vector that matches the
passed ID.

## Solution

Clarify that.

## Type of Change

- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] This change requires a documentation update
- [ ] Infrastructure change (CI configs, etc)
- [x] Non-code change (docs, etc)
- [ ] None of the above: (explain here)


---
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README.md

@@ -792,7 +792,8 @@ const results = await index.query({ topK: 3, vector: [0.22, 0.66] });
 
 #### Querying by record id
 
-You can query using the vector values of an existing record in the index by passing a record id.
+You can query using the vector values of an existing record in the index by passing a record ID. Please note that
+the record with the specified ID [may be in this operation's response](https://docs.pinecone.io/troubleshooting/limitations-of-querying-by-id).
 
 ```typescript
 import { Pinecone } from '@pinecone-database/pinecone';