Add Warning Prompt for File Write Operations in Elixir Learning Documentation

[eastack]

When I was following the documentation to learn Elixir just now, I entered the following code in iex: {:ok, file} = File.open("/home/username/.zshrc", [:write]). This ended up clearing my .zshrc configuration file. Fortunately, I had a backup. However, if others don't have a backup or input the path to a more important file, I understand this could result in their files being cleared. Therefore, I added a warning prompt when dealing with File.open("path/to/file/hello", [:write]). English is not my native language, and I used AI to translate these prompts. Feel free to modify if it's not good enough, but I feel it's necessary to give readers a heads-up, as there's still some risk involved.

[sabiwara]

Thanks for the pull-request @eastack.

Alternative idea: Maybe we could use a path like /tmp/elixir_getting_started.txt so that the reader doesn't need to come up with a path in the first place?

[eastack]

Here, due to the diverse audience (e.g., Windows users), there's always a risk of varying interpretations of this code. However, perhaps we could consider using [:append] instead of [:write]? What do you think? (This appears to be relatively safer. If readers understand why/how to change :append to :write, then they likely understand what they're doing). @sabiwara

[josevalim]

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