chore(documentation): document noteCommitment vs noteHash (#2127)

resolves #1679

docs/docs/dev_docs/limitations/main.md

@@ -247,6 +247,10 @@ A note which is created and nullified during the very same transaction is called
 For the time being, such chopped notes are still emitted through encrypted logs (which is the communication channel to transmit notes). When a log containing a chopped note is processed, a warning will be logged about a decrypted note which does not exist in data tree. We [improved](https://github.com/AztecProtocol/aztec-packages/issues/1603) error logging to help identify such an occurence. However, this might be a source of confusion.
 This issue is tracked in ticket [#1641](https://github.com/AztecProtocol/aztec-packages/issues/1641).
 
+### Note Terminology: Note Commitments and Note Hashes
+
+The notes or UTXOs in Aztec need to be compressed before they are added to the trees. To do so, we need to hash all the data inside a note using a collision-resistant hash function. Currently, we use Pedersen hash (using lookup tables) to compress note data. The compressed note data is referred to as "note commitments" in our architecture. However, note commitments are referred to as "note hashes" in aztec-noir code. Be mindful of that fact that note commitments and note hashes mean the same thing. Note that we only mean to talk about terminology here and in no way one should infer security/cryptographic properties (e.g., hiding, binding) based on the name. Namely, notes come with different flavours of security properties depending on the use case.   
+
 ## There's more
 
 See the [GitHub issues](https://github.com/AztecProtocol/aztec-packages/issues) for all known bugs fixes and features currently being worked on.