update docs to reflect --state-dir --disable-ledger changes

cardano-db-sync/app/cardano-db-sync.hs

@@ -28,15 +28,18 @@ main = do
         (Just _, True ) -> run params
         (Nothing, False ) -> run params
         (Just _, False ) -> Text.putStrLn $
-          "Error: Using `--dissable-ledger` doesn't require having a --state-dir. " <> moreDetails
+          "Error: Using `--dissable-ledger` doesn't require having a --state-dir. " <> moreDetailsDisableLedger
         (Nothing, True) -> Text.putStrLn $
-          "Error: If not using --state-dir then make sure to have --dissable-ledger. " <> moreDetails
+          "Error: If not using --state-dir then make sure to have --dissable-ledger. " <> moreDetailsStateDir
   where
     knownMigrationsPlain :: [(Text, Text)]
     knownMigrationsPlain = (\x -> (hash x, filepath x)) <$> knownMigrations
 
-    moreDetails :: Text
-    moreDetails = "For more details view https://github.com/input-output-hk/cardano-db-sync/blob/master/doc/configuration.md#--disable-ledger"
+    moreDetailsDisableLedger :: Text
+    moreDetailsDisableLedger = "For more details view https://github.com/input-output-hk/cardano-db-sync/blob/master/doc/configuration.md#--disable-ledger"
+
+    moreDetailsStateDir :: Text
+    moreDetailsStateDir = "For more details view https://github.com/input-output-hk/cardano-db-sync/blob/master/doc/syncing-and-rollbacks.md#ledger-state"
 
     run :: SyncNodeParams -> IO ()
     run prms = do

doc/configuration.md

@@ -30,7 +30,7 @@ When this flag is enabled, some features are missing and some DB tables are left
 
 Warning: Running db-sync with this flag and then restarting it without the flag will cause crashes and should be avoided.
 
-Known issues: When this flag in enabled, the `--state-dir` option still needs to be provided, even though db-sync will completely ignore it.
+Warning: It was previously required to still have a `--state-dir` option provided when in conjunction with `--disable-ledger`. This is no longer the case and now an error will occure if they are both present at the same time. 
 
 If used with docker, this flag can be provided as an extra flag to docker image.
 

doc/syncing-and-rollbacks.md

@@ -26,6 +26,8 @@ argument to `db-sync`. This ledger state directory must persist across machine r
 Each ledger state is valid only for a specific block. It is not valid for any block before
 or any block after the block it is valid for.
 
+The option `--state-dir` can be ommited when one doesn't want to use local ledger, for the omittion to work a `--disable-ledger` flag should be used, more information on what this flag does can be found [here](./configuration.md#--disable-ledger).
+
 
 ## Concurrency