Fix editing, typos and grammatical errors (#6207)
Fix editing, typos and grammatical errors (#6207)

1. The current version is ~at~ on the Arduino website
2. Start Arduino and open _the_ Preferences window
3. Enter ```https://arduino.esp8266.com/stable/package_esp8266com_index.json``` into _the_ *Additional Board Manager URLs* field
4. The current version is ~at~ on the Arduino website
5. [PlatformIO](https://platformio.org?utm_source=github&utm_medium=arduino-esp8266) is an open source ecosystem for IoT
development with _a_ ~cross platform~ cross-platform build system, library manager and full support
6. [ESP8266 Community Forum](https://www.esp8266.com/u/arduinoanswers) is a ~well established~ well-established community
7. or just want to discuss how to approach a problem, (removed extra space after 'problem')
8. when encountering an issue ~which~ that happens at run time
9. attach _the_ serial output
10. Check out the list of issues ~which~ that are easy to fix
11. It is distributed under _the_ MIT license.
12. It is distributed under _the_ MIT license.
sticilface/Arduino,sticilface/Arduino,sticilface/Arduino,esp8266/Arduino,esp8266/Arduino,esp8266/Arduino,esp8266/Arduino,sticilface/Arduino,esp8266/Arduino,sticilface/Arduino