feat(docs): updated docs for bible with the cog's commands

.docs/bible.md

@@ -19,3 +19,18 @@ Then, you can use `[p]set api` to set the API key. Make sure your formatting mat
 ![image](img/bible/set-api.png)
 
 ## Commands
+
+### bible passage
+ - Usage: `[p]bible passage <book> <passage>`
+ - Aliases: `verse`
+
+Get a Bible passage.
+
+Example usage:  
+`[p]bible passage Genesis 1:1`  
+`[p]bible passage John 3:16-3:17`
+
+### bible random
+ - Usage: `[p]bible random`
+
+Get a random Bible verse.