Auto merge of #52152 - fabric-and-ink:edit-file-open-example, r=frewsxcv
Auto merge of #52152 - fabric-and-ink:edit-file-open-example, r=frewsxcv

Edit code example for File::open

It looked kinda strange and is now aligned with the other examples for `File`.

GBGamer/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,GBGamer/rust,aidancully/rust,GBGamer/rust,aidancully/rust,graydon/rust,GBGamer/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust,GBGamer/rust,graydon/rust,aidancully/rust,aidancully/rust