rpc: update docstring (ethereum#26072)

Co-authored-by: seven <[email protected]>

Author: 2 people

rpc/types.go

@@ -69,7 +69,7 @@ const (
 )
 
 // UnmarshalJSON parses the given JSON fragment into a BlockNumber. It supports:
-// - "latest", "earliest" or "pending" as string arguments
+// - "safe", "finalized", "latest", "earliest" or "pending" as string arguments
 // - the block number
 // Returned errors:
 // - an invalid block number error when the given argument isn't a known strings
@@ -110,7 +110,7 @@ func (bn *BlockNumber) UnmarshalJSON(data []byte) error {
 }
 
 // MarshalText implements encoding.TextMarshaler. It marshals:
-// - "latest", "earliest" or "pending" as strings
+// - "safe", "finalized", "latest", "earliest" or "pending" as strings
 // - other numbers as hex
 func (bn BlockNumber) MarshalText() ([]byte, error) {
 	switch bn {