Merge PR #5463: docs: add link to iavl documentation

docs/architecture/adr-009-evidence-module.md

@@ -179,4 +179,4 @@ due to the inability to introduce the new evidence type's corresponding handler
 
 - [ICS](https://github.com/cosmos/ics)
 - [IBC Architecture](https://github.com/cosmos/ics/blob/master/ibc/1_IBC_ARCHITECTURE.md)
-- [Tendermint Fork Accountability](https://github.com/tendermint/tendermint/blob/master/docs/spec/consensus/fork-accountability.md)
+- [Tendermint Fork Accountability](https://github.com/tendermint/spec/blob/7b3138e69490f410768d9b1ffc7a17abc23ea397/spec/consensus/fork-accountability.md)

docs/core/store.md

@@ -150,6 +150,8 @@ The default implementation of `KVStore` and `CommitKVStore` used in `baseapp` is
 - Iteration efficiently returns the sorted elements within the range.
 - Each tree version is immutable and can be retrieved even after a commit (depending on the pruning settings). 
 
+The documentation on the IAVL Tree is located [here](https://github.com/tendermint/iavl/blob/f9d4b446a226948ed19286354f0d433a887cc4a3/docs/overview.md).
+
 ### `DbAdapter` Store
 
 `dbadapter.Store` is a adapter for `dbm.DB` making it fulfilling the `KVStore` interface.

docs/spec/README.md

@@ -23,4 +23,4 @@ Go the [module directory](../../x/README.md)
 ## Tendermint
 
 For details on the underlying blockchain and p2p protocols, see
-the [Tendermint specification](https://github.com/tendermint/tendermint/tree/master/docs/spec).
+the [Tendermint specification](https://github.com/tendermint/spec/tree/master/spec).