docs/esp8266/tutorial/intro: Add anchor for link from quickeref.
docs/esp8266/tutorial/intro: Add anchor for link from quickeref.

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hon,TDAbboud/micropython,deshipu/micropython,ganshun666/micropython,alex-march/micropython,alex-march/micropython,ryannathans/micropython,oopy/micropython,kerneltask/micropython,redbear/micropython,tobbad/micropython