Update api.md - addChatPattern[Set] link to example of usage (#3304)

Co-authored-by: Romain Beaumont <[email protected]>

Author: boly38

docs/api.md

@@ -1691,6 +1691,8 @@ the event will be called `"chat:name"`, with name being the name passed
 
 returns a number which can be used with bot.removeChatPattern() to only delete this pattern
 
+- :eyes: cf. [examples/chat_parsing](https://github.com/PrismarineJS/mineflayer/blob/master/examples/chat_parsing.js#L17-L36)
+
 #### bot.addChatPatternSet(name, patterns, chatPatternOptions)
 
 make an event that is called every time all patterns havee been matched to messages,
@@ -1703,6 +1705,8 @@ the event will be called `"chat:name"`, with name being the name passed
 
 returns a number which can be used with bot.removeChatPattern() to only delete this patternset
 
+- :eyes: cf. [examples/chat_parsing](https://github.com/PrismarineJS/mineflayer/blob/master/examples/chat_parsing.js#L17-L36)
+
 #### bot.removeChatPattern(name)
 
 removes a chat pattern(s)