Change emotiBit_Example to stock_firmware

[nitin710]

Description

• The new firmware package in Arduino has the stock example moved from EmotiBit_Example to EmotiBit_stock_firmware

Type of correction

• [ ] Missing Content
• [ ] Broken Link
• [ ] Inaccurate content
• [x] Outdated/Deprecated content
• [ ] Inappropriate content
• [ ] Document structure needs updating

Link

https://github.com/EmotiBit/EmotiBit_Docs/blob/master/Keep_emotibit_up_to_date.md#programming-the-feather

Screenshots

[nitin710]

Needs to change when we make a new release. For version > v1.2.77