Fix typo stellar-sign README (#4839)

tools/stellar-sign/README.md

@@ -4,13 +4,13 @@ This folder contains `stellar-sign` a simple utility to make it easy to add your
 When run on the terminal it:
 
 1.  Prompts your for a base64-encoded envelope
-2.
- a. If -verify is used
-    i. Asks for your public key
-    ii. Outputs if the transaction has a valid signature or not
- b. If in signature mode (default)
-    i. Asks for your private seed
-    ii. Outputs a new envelope with your signature added.
+2.  
+    - If `-verify` is used
+        - Asks for your public key
+        - Outputs if the transaction has a valid signature or not
+    - If in signature mode (default)
+        - Asks for your private seed
+        - Outputs a new envelope with your signature added
 
 ## Installing