docs: new main -> renderers messageChannel example (#34978)
docs: new main -> renderers messageChannel example (#34978)

* docs: new main -> renderers messageChannel example

* consistent use of your

* fix a typo

* linting

* markdown linting

* Update docs/tutorial/message-ports.md

Co-authored-by: Erick Zhao <9d06d702b94085552421e06c8b16f2d3882b06e0@hotmail.ca>

* update code example headings, reference contextIsolation example

* remove nodeIntegration: false from browserWindows

* rename "messagePort" to "electronMessagePort" for compatibility

Co-authored-by: Erick Zhao <9d06d702b94085552421e06c8b16f2d3882b06e0@hotmail.ca>
electron/electron,electron/electron,gerhardberger/electron,gerhardberger/electron,electron/electron,gerhardberger/electron,electron/electron,electron/electron,gerhardberger/electron,gerhardberger/electron,gerhardberger/electron,electron/electron,gerhardberger/electron,electron/electron