Fix .md links

Author: chong-he

book/src/validator_manager.md

@@ -30,9 +30,9 @@ The `validator-manager` boasts the following features:
 
 ## Guides
 
-- [Creating and importing validators using the `create` and `import` commands.](./validator-manager-create.md)
-- [Moving validators between two VCs using the `move` command.](./validator-manager-move.md)
-- [Managing validators such as exit, delete, import and list validators.](./validator-manager-api.md)
+- [Creating and importing validators using the `create` and `import` commands.](./validator_manager_create.md)
+- [Moving validators between two VCs using the `move` command.](./validator_manager_move.md)
+- [Managing validators such as exit, delete, import and list validators.](./validator_manager_api.md)
 - [Creating and importing validators using the `create` and `import` commands.](./validator_manager_create.md)
 - [Moving validators between two VCs using the `move` command.](./validator_manager_move.md)
 - [Managing validators such as delete, import and list validators.](./validator_manager_api.md)

book/src/validator_manager_api.md

@@ -32,7 +32,7 @@ To exit all validators on the validator client, use the keyword `all`:
 lighthouse vm exit --vc-token ~/.lighthouse/mainnet/validators/api-token.txt --validators all --beacon-node http://localhost:5052
 ```
 
-To check the voluntary exit status, refer to [the list command](./validator-manager-api.md#list).
+To check the voluntary exit status, refer to [the list command](./validator_manager_api.md#list).
 
 The following command will only generate a presign voluntary exit message and save it to a file named `{validator_pubkey}.json`. It **will not** publish the voluntary exit to the network.
 

book/src/validator_voluntary_exit.md

@@ -10,7 +10,7 @@ A validator can initiate a voluntary exit provided that the validator is current
 It takes at a minimum 5 epochs (32 minutes) for a validator to exit after initiating a voluntary exit.
 This number can be much higher depending on how many other validators are queued to exit.
 
-You can also perform voluntary exit for one or more validators using the validator manager, see [Managing Validators](./validator-manager-api.md#exit) for more details.
+You can also perform voluntary exit for one or more validators using the validator manager, see [Managing Validators](./validator_manager_api.md#exit) for more details.
 
 ## Initiating a voluntary exit