docs: fix default indexer in config.toml (#1723)

Port of #1721 that
targets v0.38.x-celestia

Author: rootulp

config/config.go

@@ -1245,13 +1245,7 @@ func TestStorageConfig() *StorageConfig {
 // TxIndexConfig defines the configuration for the transaction indexer,
 // including composite keys to index.
 type TxIndexConfig struct {
-	// What indexer to use for transactions
-	//
-	// Options:
-	//   1) "null"
-	//   2) "kv" (default) - the simplest possible indexer,
-	//      backed by key-value storage (defaults to levelDB; see DBBackend).
-	//   3) "psql" - the indexer services backed by PostgreSQL.
+	// Indexer is the indexer to use for transactions
 	Indexer string `mapstructure:"indexer"`
 
 	// The PostgreSQL connection configuration, the connection format:

config/toml.go

@@ -358,8 +358,8 @@ type = "priority"
 recheck = {{ .Mempool.Recheck }}
 
 # recheck_timeout is the time the application has during the rechecking process
-# to return CheckTx responses, once all requests have been sent. Responses that 
-# arrive after the timeout expires are discarded. It only applies to 
+# to return CheckTx responses, once all requests have been sent. Responses that
+# arrive after the timeout expires are discarded. It only applies to
 # non-local ABCI clients and when recheck is enabled.
 #
 # The ideal value will strongly depend on the application. It could roughly be estimated as the
@@ -560,11 +560,9 @@ discard_abci_responses = {{ .Storage.DiscardABCIResponses}}
 # to decide which txs to index based on configuration set in the application.
 #
 # Options:
-#   1) "null"
-#   2) "kv" (default) - the simplest possible indexer, backed by key-value storage (defaults to levelDB; see DBBackend).
-# 		- When "kv" is chosen "tx.height" and "tx.hash" will always be indexed.
-#   3) "psql" - the indexer services backed by PostgreSQL.
-# When "kv" or "psql" is chosen "tx.height" and "tx.hash" will always be indexed.
+#   1) "null" (default) - index transaction status only
+#   2) "kv" - index transactions using key-value storage based on DBBackend. "tx.height" and "tx.hash" will always be indexed.
+#   3) "psql" - index transactions using PostgreSQL. "tx.height" and "tx.hash" will always be indexed.
 indexer = "{{ .TxIndex.Indexer }}"
 
 # The PostgreSQL connection configuration, the connection format: