Adding documentation how to create a non-32 eth deposit (#222)

docs/src/existing_mnemonic.md

@@ -37,3 +37,7 @@ A successful call to this command will result in one or many [keystore files](ke
 ```sh
 ./deposit existing-mnemonic
 ```
+
+## Note
+
+To make a deposit for a different amount other than 32 ETH, you need to have an existing keystore file or create one by using either the above command or **[new-mnemonic](new_mnemonic.md)**. Then, use the **[partial-deposit](partial_deposit.md)** command to specify the desired amount for each validator.

docs/src/new_mnemonic.md

@@ -35,3 +35,5 @@ A successful call to this command will result in one or many [keystore files](ke
 ## Note
 
 The newly generated mnemonic **must** be written down, on a piece of paper or transferred to steel. The clipboard is cleared when this command finishes. If the mnemonic is lost and the validator does not have a withdrawal address, funds **cannot** be recovered.
+
+To make a deposit for a different amount other than 32 ETH, you need to have an existing keystore file or create one by using either the above command or **[existing-mnemonic](existing_mnemonic.md)**. Then, use the **[partial-deposit](partial_deposit.md)** command to specify the desired amount for each validator.

docs/src/partial_deposit.md

@@ -3,7 +3,7 @@
 {{#include ./snippet/warning_message.md}}
 
 ## Description
-Creates a deposit file with an existing validator key. Can be used to initiate a validator or deposit to an existing validator.
+Creates a deposit file with an existing validator key. A validator key can be created using the **[new-mnemonic](new_mnemonic.md)** or the **[existing-mnemonic](existing_mnemonic.md)** commands. Can be used to initiate a validator or deposit to an existing validator.
 If you wish to create a validator with 0x00 credentials, you must use the **[new-mnemonic](new_mnemonic.md)** or the **[existing-mnemonic](existing_mnemonic.md)** command.
 
 ## Optional Arguments